fix: runner not shutting down when extension was closed

[lars-reimann]

Summary of Changes

Graceful shutdown of the runner now works again.

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ REPOSITORY	git_diff	yes		no	0.05s
✅ TYPESCRIPT	eslint	1	0	0	4.15s
✅ TYPESCRIPT	prettier	1	0	0	0.81s

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (31b8a28) to head (9aa5190).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1094 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 104 104 Lines 20599 20599 Branches 4069 4069 ========================================= Hits 20599 20599 ```

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[lars-reimann]

Since the shutdown message was not sent, we got into the 2.5s timeout. Apparently, during this time, the extension host was killed, so it could never tree-kill the spawned processes.

[lars-reimann]

:tada: This PR is included in version 0.13.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• v0.13.0
• GitHub release

Your semantic-release bot :package::rocket: