Disable edit prediction in Cloudflare Workers `.dev.vars` files (#24838)

Marshall Bowers created 

This PR adds `.dev.vars` files as a default exclusion for edit
prediction.

These files are used by Cloudflare Workers and are likely to contain
secrets.

Release Notes:

- Excluded Cloudflare Workers `.dev.vars` files from edit prediction.

Change summary

assets/settings/default.json | 1 +
1 file changed, 1 insertion(+)

Detailed changes

assets/settings/default.json 🔗 

@@ -788,6 +788,7 @@
       "**/*.key",
       "**/*.cert",
       "**/*.crt",
+      "**/.dev.vars",
       "**/secrets.yml"
     ],
     // When to show edit predictions previews in buffer.