Don't generate crash reports on the Dev channel (#35915)

We only want minidumps to be generated on actual release builds. Now we
avoid spawning crash handler processes for dev builds. To test
minidumping you can still set the `ZED_GENERATE_MINIDUMPS` env var which
force-enable the feature.

Release Notes:

- N/A

Cargo.lock

@@ -4014,6 +4014,7 @@ dependencies = [
  "log",
  "minidumper",
  "paths",
+ "release_channel",
  "smol",
  "workspace-hack",
 ]