fix: Fix sessions disappearing from trees caused by zowe.extRefresh

[t1m0thyj]

Proposed changes

Ports #3009 from vNext to the main branch

This PR removes some Theia-specific logic in the config watcher. I've tested in Theia that there is no regression for #2211

Release Notes

Milestone: 2.18.0

Changelog: Fixed issue where creating a new team configuration file could cause Zowe Explorer to crash, resulting in all sessions disappearing from trees

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change which adds or improves functionality)
• Breaking change (a change that would cause existing functionality to not work as expected)
• Documentation (Markdown, README updates)
• Other (please specify above in "Proposed changes" section)

Checklist

General

• I have read the CONTRIBUTOR GUIDANCE wiki
• All PR dependencies have been merged and published (if applicable)
• A GIF or screenshot is included in the PR for visual changes
• The pre-publish command has been executed:
  • v2 and below: yarn workspace vscode-extension-for-zowe vscode:prepublish
  • v3: pnpm --filter vscode-extension-for-zowe vscode:prepublish

Code coverage

• There is coverage for the code that I have added
• I have added new test cases and they are passing
• I have manually tested the changes

Deployment

• I have added developer documentation (if applicable)
• Documentation should be added to Zowe Docs
  • If you're an outside contributor, please post in the #zowe-doc Slack channel to coordinate documentation.
  • Otherwise, please check with the rest of the squad about any needed documentation before merging.
• These changes may need ported to the appropriate branches (list here):

Further comments

[codecov]

Codecov Report

Attention: Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.48%. Comparing base (acc3ccf) to head (ab1013d).
Report is 2 commits behind head on main.

Files	Patch %	Lines
packages/zowe-explorer/src/utils/TreeViewUtils.ts	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3018      +/-   ##
==========================================
+ Coverage   93.47%   93.48%   +0.01%     
==========================================
  Files         104      104              
  Lines       10978    10982       +4     
  Branches     2415     2295     -120     
==========================================
+ Hits        10262    10267       +5     
+ Misses        715      714       -1     
  Partials        1        1              

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[sonarqubecloud]

Quality Gate failed

Failed conditions
3.7% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[traeok]

With these changes, the sessions persist in the trees and the experience is definitely smoother - LGTM. Thanks @t1m0thyj for looking into these adjustments.