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 55.20170% with 211 lines in your changes missing coverage. Please review.

Project coverage is 36.06%. Comparing base (b51d5c2) to head (7ed04ed).

Files with missing lines	Patch %	Lines
...rees/CICSCombinedTrees/CICSCombinedResourceTree.ts	19.44%	29 Missing ⚠️
...ckages/vsce/src/commands/clearPlexFilterCommand.ts	12.90%	27 Missing ⚠️
...ackages/vsce/src/commands/showAttributesCommand.ts	0.00%	25 Missing ⚠️
...ckages/vsce/src/commands/getFilterPlexResources.ts	4.34%	22 Missing ⚠️
packages/vsce/src/trees/CICSPlexTree.ts	0.00%	14 Missing ⚠️
packages/vsce/src/trees/CICSTree.ts	0.00%	9 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 ⚠️
... and 27 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
+ Coverage   28.56%   36.06%   +7.50%     
==========================================
  Files         147      134      -13     
  Lines        5031     3943    -1088     
  Branches      882      618     -264     
==========================================
- Hits         1437     1422      -15     
+ Misses       3594     2521    -1073     

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