Add 'teams' to .gitignore in templates/examples that generate a teams/ directory

Description

IGNORED_DIRS in tests/spfx-template-test/src/tests/templates.test.ts includes teams, which excludes the teams/ directory from template scaffolding comparison and sync. However, teams/ is not listed in the .gitignore files of the templates or examples that generate it (e.g. webpart-react).

The teams/ directory should be added to the .gitignore of each template/example that generates it, so that the traversal skips it naturally via the gitignore matcher rather than relying on the hardcoded IGNORED_DIRS list. This would make the exclusion self-documenting and consistent with how other generated directories (e.g. dist, lib) are handled.

Alternatives considered

Removing teams from IGNORED_DIRS and including it in comparison/sync — but this would require the teams/ PNG assets to be reproducible across scaffold runs, which should be verified first.

Related

Noted as a follow-up in #231.

Start with tests/spfx-template-test/src/tests/templates.test.ts and its IGNORED_DIRS handling, then inspect the .gitignore files for templates and examples that generate teams/, including webpart-react. Update each relevant .gitignore and run the template scaffolding comparison and sync tests; done means generated teams/ directories are excluded through gitignore matching consistently.