[supervisor] Improve git status calls to disable optional locks

[mustard-mh]

Description

Add GIT_OPTIONAL_LOCKS to supervisor git status, to prevent it creates index.lock

       --no-optional-locks
           Do not perform optional operations that require locks. This is equivalent to setting the GIT_OPTIONAL_LOCKS
           to 0.

       GIT_OPTIONAL_LOCKS
           If this Boolean environment variable is set to false, Git will complete any
           requested operation without performing any optional sub-operations that
           require taking a lock. For example, this will prevent git status from
           refreshing the index as a side effect. This is useful for processes running
           in the background which do not want to cause lock contention with other
           operations on the repository. Defaults to 1.

Related Issue(s)

Relates CLC-1235

How to test

1. Start a workspace in preview env
2. It should be able to report git status changes
3. Watch .git folder, there should have no index.lock file generated every 5 seconds

Documentation

Preview status

Gitpod was successfully deployed to your preview environment.

• 🏷️ Name - hw-vsc-hanging
• 🔗 URL - hw-vsc-hanging.preview.gitpod-dev.com/workspaces.
• 📚 Documentation - See our internal documentation for information on how to interact with your preview environment.
• 📦 Version - hw-vsc-hanging-gha.32054
• 🗒️ Logs - GCP Logs Explorer

Build Options

Build

• /werft with-werft
  Run the build with werft instead of GHA
• leeway-no-cache
• /werft no-test
  Run Leeway with --dont-test

Publish

• /werft publish-to-npm
• /werft publish-to-jb-marketplace

Installer

• analytics=segment
• with-dedicated-emulation
• workspace-feature-flags
  Add desired feature flags to the end of the line above, space separated

Preview Environment / Integration Tests

• /werft with-local-preview
  If enabled this will build install/preview
• /werft with-preview
• /werft with-large-vm
• /werft with-gce-vm
  If enabled this will create the environment on GCE infra
• /werft preemptible
  Saves cost. Untick this only if you're really sure you need a non-preemtible machine.
• with-integration-tests=all
  Valid options are all, workspace, webapp, ide, jetbrains, vscode, ssh. If enabled, with-preview and with-large-vm will be enabled.
• with-monitoring

/hold

[iQQBot]

Tested I can still see git status in dashboard, and I also use inotifywait to monitor the file changes to make sure there is no index.lock create/delete periodically (only one, because I manual run git status)