chore: remove che-theia, theia plugins and all references

[svor]

What does this PR do?

• Remove che-theia editor from the plugin registry
• Remove che-theia plugins from the registry
• Remove sidecars from the registry

What issues does this PR fix or reference?

eclipse-che/che#22090

How to test this PR?

Check the plugin registry content generated by this PR: https://pr-check-1629-che-plugin-registry.surge.sh/
If you want to start a workspace:

• Use quay.io/vsvydenk/che-plugin-registry:no-theia image for plugin registry in CheCluster CRD
• workspace with che-code should start

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[github-actions]

Click here to review and test in web IDE:

[codecov]

Codecov Report

Merging #1629 (3756450) into main (d874c08) will increase coverage by 6.31%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main     #1629      +/-   ##
===========================================
+ Coverage   93.68%   100.00%   +6.31%     
===========================================
  Files          47        21      -26     
  Lines        1457       563     -894     
  Branches      253        88     -165     
===========================================
- Hits         1365       563     -802     
+ Misses         92         0      -92     

Impacted Files	Coverage Δ
tools/build/src/common/common-module.ts	100.00% <ø> (ø)
tools/build/src/common/container-helper.ts	100.00% <ø> (ø)
tools/build/src/common/volume-mount-helper.ts	100.00% <ø> (ø)
...ols/build/src/devfile/meta-yaml-to-devfile-yaml.ts	100.00% <ø> (ø)
tools/build/src/editor/che-editors-analyzer.ts	100.00% <ø> (ø)
...uild/src/editor/che-editors-meta-yaml-generator.ts	100.00% <ø> (ø)
tools/build/src/editor/editor-module.ts	100.00% <ø> (ø)
tools/build/src/entrypoint.ts	100.00% <ø> (ø)
tools/build/src/inversify-binding.ts	100.00% <ø> (ø)
tools/build/src/main.ts	100.00% <ø> (ø)
... and 5 more

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[nickboldt]

we need a yarn v1 lock file for cachito, though :(

[svor]

it should be a part of another PR

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ibuziuk, svor

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