:bug: Fix support-bundle collection on e2e failure (#2755)

Add test/e2e/support-bundle.yaml spec file with collectors for cluster
diagnostics and pass it to the support-bundle CLI in the e2e workflow.

Fixes the "no collectors specified to run" error introduced in #2750.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>