Disable instance handshake in dev builds (#3485)

Julia created 

It feels like every week or two someone hits this and is confused about
why the app isn't launch, been meaning to disable this in dev builds for
a while. This does mean that it'll be possible to hit the local DB lock
panic in a dev build if you run it multiple times but that is so rare
that it seems preferable

Release Notes:

- N/A

Change summary

crates/client/src/telemetry.rs   | 1 -
crates/zed/src/only_instance.rs  | 2 +-
crates/zed2/src/only_instance.rs | 2 +-
3 files changed, 2 insertions(+), 3 deletions(-)

Detailed changes

crates/client/src/telemetry.rs 🔗 

@@ -350,7 +350,6 @@ impl Telemetry {
             milliseconds_since_first_event: self.milliseconds_since_first_event(),
         };
 
-        dbg!(telemetry_settings);
         self.report_clickhouse_event(event, telemetry_settings, true)
     }

crates/zed/src/only_instance.rs 🔗 

@@ -39,7 +39,7 @@ pub enum IsOnlyInstance {
 }
 
 pub fn ensure_only_instance() -> IsOnlyInstance {
-    if *db::ZED_STATELESS {
+    if *db::ZED_STATELESS || *util::channel::RELEASE_CHANNEL == ReleaseChannel::Dev {
         return IsOnlyInstance::Yes;
     }

crates/zed2/src/only_instance.rs 🔗 

@@ -39,7 +39,7 @@ pub enum IsOnlyInstance {
 }
 
 pub fn ensure_only_instance() -> IsOnlyInstance {
-    if *db::ZED_STATELESS {
+    if *db::ZED_STATELESS || *util::channel::RELEASE_CHANNEL == ReleaseChannel::Dev {
         return IsOnlyInstance::Yes;
     }