tests: "ENOSPC: System limit for number of file watchers reached"

# Problem

Linux unit tests sometimes fail:

```
1) WinstonToolkitLogger
logs to a file
does not log a lower level:
Error: ENOSPC: System limit for number of file watchers reached, watch '/tmp/aws-toolkit-vscode/vsctkxDXHCi'
at FSWatcher. (node:internal/fs/watchers:244:19)
at Object.watch (node:fs:2247:34)
at /codebuild/output/src3581993545/src/github.com/aws/aws-toolkit-vscode/src/test/shared/logger/winstonToolkitLogger.test.ts:27:28
at new Promise ()
at /codebuild/output/src3581993545/src/github.com/aws/aws-toolkit-vscode/src/test/shared/logger/winstonToolkitLogger.test.ts:26:19
```

# Proposal

- Eliminate `createLogWatcher` https://github.com/aws/aws-toolkit-vscode/blob/e7116952ab3503199420f30ce8656e07d8b36ad0/src/shared/logger/activation.ts#L168
- it only shows a message, no other functional purpose
- 
- if the log file is deleted, Toolkit continues to work correctly, and logs to the vscode output channel
- Revert https://github.com/aws/aws-toolkit-vscode/commit/9e380d1baa4aed5598c1ce3a1c895854726dab3f

Start with src/test/shared/logger/winstonToolkitLogger.test.ts, where the Linux ENOSPC failure occurs, and inspect createLogWatcher in src/shared/logger/activation.ts. Check the referenced commit and verify that the unit test no longer reaches the file-watcher limit while logging behavior remains covered.

Written by the indexing model from the issue text.