doc(changelog): Introduce changelog workflow and update templates

[zFernand0]

Proposed changes

• Introduce a check for changelog files to be updated in every PR
• Update templates to implement TSC suggestions
  • https://github.com/zowe/community/blob/tsc/issues/policy/Technical-Steering-Committee/issues.md
• Added extra headers to the Changelogs to clearly separate enhancements from bug fixes

These changes were tested in:

• attempt to add pnpm support zFernand0/vscode-extension-for-zowe#1

Release Notes

• Fix Update Issue Templates #822
• Fix Changelog Updated added in Github Actions #970
• Fix Improve the Changelog structure #1302

Milestone: N/A

Changelog: N/A

Types of changes

What types of changes does your code introduce to Zowe Explorer?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Updates to Documentation or Tests (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This checklist will be used as reference for both the contributor and the reviewer

• I have read the CONTRIBUTOR GUIDANCE wiki
• PR title follows Conventional Commits Guidelines
• PR Description is included
• gif or screenshot is included if visual changes are made
• yarn workspace vscode-extension-for-zowe vscode:prepublish has been executed
• All checks have passed (DCO, Jenkins and Code Coverage)
• I have added unit test and it is passing
• I have added integration test and it is passing
• There is coverage for the code that I have added
• I have tested it manually and there are no regressions found
• I have added necessary documentation (if appropriate)
• Any PR dependencies have been merged and published (if appropriate)

Further comments

[codecov]

Codecov Report

Base: 74.71% // Head: 74.71% // No change to project coverage 👍

Coverage data is based on head (1cfd4f1) compared to base (891080b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1968   +/-   ##
=======================================
  Coverage   74.71%   74.71%           
=======================================
  Files          63       63           
  Lines        7070     7070           
  Branches     1523     1523           
=======================================
  Hits         5282     5282           
  Misses       1781     1781           
  Partials        7        7           

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[JillieBeanSim]

Looks great! thanks @zFernand0

[JillieBeanSim]

Created the label no-changelog for PRs not requiring the update and added a note to the issue for adding info about the label in the contributing doc.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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