Re-apply Web Components Grids fixes

[damyanpetev]

Cherry-pick 7b0d992 from #1562 that got lost merge conflict resolutions somehow.

Edit: Strike that, picking both commits from PR since both are gone from master.

[coveralls]

coverage: 86.413% (+8.8%) from 77.588%
when pulling d9a9967 on dpetev/pick-reverted-tests
into e5a69f0 on master.

[Copilot]

Pull request overview

Adds/adjusts template-spec checks to ensure template metadata is valid and to detect potential template file collisions, including new coverage for Web Components (igc-ts) templates. This aligns with the intent of PR #1562 to harden template correctness checks.

Changes:

• Add a new webcomponents-spec.ts to verify Web Components templates have IDs and do not collide internally for igc-ts.
• Initialize the CLI core App container in template specs (beforeAll) to ensure filesystem-backed utilities work during tests.
• Improve collision-test assertion messages by switching to withContext(...).toBeTruthy().

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

File	Description
spec/templates/webcomponents-spec.ts	New spec covering Web Components template IDs and igc-ts collision checks.
spec/templates/react-spec.ts	Adds App.initialize() and improves collision assertion context formatting.
spec/templates/jquery-spec.ts	Adds App.initialize() and updates ID assertion to use withContext.
spec/templates/angular-spec.ts	Adds App.initialize() and improves collision assertion context formatting.

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