Various improvements to z/OS console panel

[JWaters02]

Proposed changes

There are 3 parts to this PR:

1. Fixes Zowe Explorer z/OS Console Missing Icon in Activity View #3293 by adding "chevron-right" icon from the official VSCode icons pack
2. Renames the long-winded "Zowe Explorer z/OS Console" to just "z/OS Console"
3. Fixes that (especially in dark themes) the z/OS Console panel background colour was not in sync with the rest of the VSCode styling - this involves replacing the (deprecated) vscode webviews component with raw html/css as that library's components' stylings cannot be overriden

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

It's a funny coincidence that phaumer posted this suggestion of renaming the panel view after I had starting working on this PR 🙂

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.49%. Comparing base (5c645bc) to head (a816c5b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3445   +/-   ##
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  Coverage   93.49%   93.49%           
=======================================
  Files         120      120           
  Lines       12694    12694           
  Branches     2934     2930    -4     
=======================================
  Hits        11868    11868           
  Misses        825      825           
  Partials        1        1           

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[JWaters02]

Not sure what the changelog entry for this one should be since it's a few things bundled into one.

[JillieBeanSim]

Not sure what the changelog entry for this one should be since it's a few things bundled into one.

Hey @JWaters02 can list them separated by comma or via bullet list if you would like, we can also add @anaxceron to help fine tune the changelog entry.

[JillieBeanSim]

the fixes LGTM! thanks @JWaters02

[JillieBeanSim]

LGTM, thanks for adding changelogs @JWaters02

[t1m0thyj]

Thanks @JWaters02 for your contribution! Left a comment about the panel icon