Refactor resource trees to common TreeItem

[AndrewTwydell]

What It Does

Requires PR #213

Most code for each resource tree was repeated. This uses a common tree and arguments to create the trees.

It also removes the top level Web folder as this was fed back as unecessary.

This will allow us to create a panel for users to select which resources they'd like trees for to unclutter the treeview.

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 61.35881% with 182 lines in your changes missing coverage. Please review.

Project coverage is 42.29%. Comparing base (f930e66) to head (1da3448).

Files with missing lines	Patch %	Lines
...ckages/vsce/src/commands/clearPlexFilterCommand.ts	12.90%	27 Missing ⚠️
...rees/CICSCombinedTrees/CICSCombinedResourceTree.ts	27.77%	26 Missing ⚠️
...ackages/vsce/src/commands/showAttributesCommand.ts	0.00%	25 Missing ⚠️
...ckages/vsce/src/commands/getFilterPlexResources.ts	4.34%	22 Missing ⚠️
packages/vsce/src/commands/inquireProgram.ts	25.00%	6 Missing ⚠️
packages/vsce/src/commands/inquireTransaction.ts	33.33%	6 Missing ⚠️
...ommands/disableCommands/disableLocalFileCommand.ts	0.00%	5 Missing ⚠️
.../commands/disableCommands/disableProgramCommand.ts	0.00%	5 Missing ⚠️
packages/vsce/src/commands/purgeTaskCommand.ts	0.00%	4 Missing ⚠️
...ackages/vsce/src/commands/closeLocalFileCommand.ts	0.00%	3 Missing ⚠️
... and 24 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
+ Coverage   39.91%   42.29%   +2.38%     
==========================================
  Files         147      134      -13     
  Lines        5003     3915    -1088     
  Branches      873      586     -287     
==========================================
- Hits         1997     1656     -341     
+ Misses       3006     2259     -747     

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