Fix Theia integration tests

[t1m0thyj]

Proposed changes

Fixes #2977 by updating element IDs in tests.

Also updates workflow to use new VSCE directory supported by Theia (see https://github.com/eclipse-theia/theia/pull/13178).

Release Notes

Milestone:

Changelog:

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

This PR is probably a good candidate to be squash merged 😋

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

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

Project coverage is 93.49%. Comparing base (eeb6c06) to head (08daa39). Report is 2 commits behind head on maintenance.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## maintenance #2979 +/- ## ============================================ Coverage 93.49% 93.49% ============================================ Files 104 104 Lines 10845 10845 Branches 2262 2353 +91 ============================================ Hits 10139 10139 Misses 705 705 Partials 1 1 ```

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