[WIP] feat(extensions): refactor marketplace plugins to be extensions plugins

[debsmita1]

Hey, I just made a Pull Request!

Resolves:

✔️ Checklist

• [] A changeset describing the change and affected packages. (more info)
• Added or Updated documentation
• Tests for new functionality and regression tests for bug fixes
• [] Screenshots attached (for UI changes)

[rhdh-gh-app]

Important

This PR includes changes that affect public-facing API. Please ensure you are adding/updating documentation for new features or behavior.

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @red-hat-developer-hub/extensions-cli
• @red-hat-developer-hub/backstage-plugin-extensions-backend

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
app	workspaces/extensions/packages/app	none	v0.0.0
backend	workspaces/extensions/packages/backend	none	v0.0.0
@red-hat-developer-hub/extensions-cli	workspaces/extensions/packages/cli	none	v0.5.0
@red-hat-developer-hub/backstage-plugin-catalog-backend-module-extensions	workspaces/extensions/plugins/catalog-backend-module-extensions	minor	v0.5.0
@red-hat-developer-hub/backstage-plugin-extensions-backend	workspaces/extensions/plugins/extensions-backend	none	v0.8.0
@red-hat-developer-hub/backstage-plugin-extensions-common	workspaces/extensions/plugins/extensions-common	minor	v0.8.0
@red-hat-developer-hub/backstage-plugin-extensions	workspaces/extensions/plugins/extensions	minor	v0.9.3

[sonarqubecloud]

Quality Gate failed

Failed conditions
42.6% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud