Revert "build(deps): update yarn packages and resolve build, test, an…

[ditman]

Revert "build(deps): update yarn packages and resolve build, test, and lint deprecations (#1616)"

This reverts commit 85381fc.

Pre-launch Checklist

• I signed the CLA.
• I read the Contributors Guide.
• I read the Style Guide.
• I have added updates to the CHANGELOG.
• I updated/added relevant documentation.
• My code changes (if any) have tests.
• If my branch is on fork, I have verified that scripts/e2e_test.sh passes.

If you need help, consider asking for advice on the discussion board.

[gemini-code-assist]

Code Review

This pull request downgrades numerous dependencies across the repository's renderers, samples, and tools, including reverting React to v18 and Angular CDK/Material to v20. Key feedback on these changes addresses a critical version mismatch between Angular core and Material packages, and warns that lowering the bundle budget limits in angular.json will likely trigger production build failures. Additionally, reviewers recommend keeping test assertions inside the waitFor block to prevent flakiness, retaining ESLint disable comments in layout.tsx to avoid Next.js custom font linting errors, and removing redundant tslib declarations from devDependencies.

[ditman]

Well, this won't run until conflicts are resolved and I won't do that right now.