Do not descend into ignored directories, to avoid tracking their state.

I accidentally left the test assertions unnecessarily vague in
https://github.com/zed-industries/zed/pull/3348. This PR makes the
assertions constrain the behavior more specifically. I also added a
second test for a related bug that was fixed in that PR, about
performing and undoing an edit while a buffer reload is in-progress.

Release Notes:

- NA

Ensure actions are registed just once (previously some were registered on both Workspace and search bar itself).

Get rid of the following warnings:

```
The example target `test_app` in package `live_kit_client2 v0.1.0 (/Users/someonetoignore/work/zed/zed/crates/live_kit_client2)` has the same output filename as the example target `test_app` in package `live_kit_client v0.1.0 (/Users/someonetoignore/work/zed/zed/crates/live_kit_client)`.
Colliding filename is: /Users/someonetoignore/work/zed/zed/target/debug/examples/test_app
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
warning: output filename collision.
The example target `test_app` in package `live_kit_client2 v0.1.0 (/Users/someonetoignore/work/zed/zed/crates/live_kit_client2)` has the same output filename as the example target `test_app` in package `live_kit_client v0.1.0 (/Users/someonetoignore/work/zed/zed/crates/live_kit_client)`.
Colliding filename is: /Users/someonetoignore/work/zed/zed/target/debug/examples/test_app.dSYM
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.

---------------

warning: output filename collision.
The bin target `Zed` in package `zed2 v0.109.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/zed2)` has the same output filename as the bin target `Zed` in package `zed v0.113.0 (/Users/administrator/actions-runner-1/_work/zed/zed/crates/zed)`.
Colliding filename is: /Users/administrator/actions-runner-1/_work/zed/zed/target/debug/Zed.dSYM
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
```

as we plant to build *.dmg of both versions for a while.

Release Notes:

- N/A

and a bunch of random workspace stuff!

Release Notes:

-

ShapedLines are never wrapped, whereas WrappedLines are optionally
wrapped if they are associated with a wrap width. Originally, when
rewriting GPUI, I tried to combine everything because wrapping is
inherently optional for the Text element, but we have a bunch of APIs
that don't make sense on a line that may wrap, so we need a distinct
type for that case.

This is a precursor to implementing clickable links in markdown. I
noticed multiple places where we were confused about whether or not the
line was wrapped so this felt important.

Release Notes:

- N/A

Also featuring:
* IconButton#action()
* gpui::ManagedView
* `menu_handle()`

Release Notes:

- N/A

ShapedLines are never wrapped, whereas WrappedLines are optionally wrapped if
they are associated with a wrap width. I tried to combine everything because
wrapping is inherently optional for the Text element, but we have a bunch of
APIs that don't make sense on a line that may wrap, so we need a distinct type
for that case.

And some games with rust traits

### Summary

This PR fixes a bug that @as-cii and @osiewicz saw when the on-disk
contents of files changed due to running `git checkout` at the command
line. It caused a buffer's contents to diverge from the file's on disk
contents, but the buffer to show an *unmodified* status.

I've also introduced new APIs on gpui's deterministic executor, which
make it possible to write a test that reliably triggered the bug.

### Details

The bug is triggered by the following sequence of events:
1. A buffer's file changes on disk while the buffer is *unmodified*
2. Zed reloads the new content of the file
3. Before updating the buffer itself, Zed computes a *diff* between the
buffer's current contents, and the newly-loaded contents
4. While this diff is being computed, one of two things happens:
     1. the buffer changes on-disk *again*.
2. the user edits the buffer, but undoes the edit, so that the buffer
returns to an unmodified state

The bug itself was caused by a few things:
* The buffer diffing algorithm is pretty slow, because we perform a
character-wise diff
* We previously allowed multiple reload tasks to run concurrently
* When discarding an out-of-date diff, we failed to update parts of the
buffer's state (`saved_fingerprint`) which allow us to recognize that
the buffer's content differs from the file.

It was also difficult to reproduce the problem in tests, because under
deterministic execution, because it was extremely unlikely for other
tasks to make progress *after* a file had been reloaded, but *before*
the disk task has resolved. To help with testing, I introduced a pair of
executor APIs:

`spawn_labeled`, - for spawning a background task with a given *label*
`deprioritize_task` - for forcing tasks with a given label to run
*after* all other concurrent tasks.

I also made the `Model::next_event` test helper method more useful, in
that it no longer runs *until* parked in order to wait for the next
event to occur. It just steps the executor one poll at a time until the
model emits an event.

Release Notes:

- Fixed a bug that caused buffers to report incorrect modified/conflict
status when their buffers changed on disk multiple times in rapid
succession.

It applies to a family of tasks, not a task.