refactor: Use Mustache instead of Handlebars

[traeok]

Proposed changes

Uses the mustache dependency instead of handlebars to minimize dependency count.

Release Notes

Milestone: vNext

Changelog: Removed handlebars dependency in favor of mustache for technical currency purposes.

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)
• [x] Other (please specify above in "Proposed changes" section)

Checklist

General

• [x] I have read the CONTRIBUTOR GUIDANCE wiki
• [ ] A GIF or screenshot is included in the PR for visual changes
• [x] 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

• [x] There is coverage for the code that I have added
• [ ] I have added new test cases and they are passing
• [x] 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):

[codecov[bot]]

Codecov Report

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

Project coverage is 92.66%. Comparing base (253365c) to head (02e3a50).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## next #2975 +/- ## ========================================== - Coverage 92.68% 92.66% -0.02% ========================================== Files 111 111 Lines 11017 11017 Branches 2343 2381 +38 ========================================== - Hits 10211 10209 -2 - Misses 804 806 +2 Partials 2 2 ```

:umbrella: View full report in Codecov by Sentry.
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[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