K8s E2E test suite is failing

[pront]

Summary

All 4 K8s E2E test matrix jobs consistently time out at 45 minutes with Helm context deadline exceeded errors. This went undetected because no PR between March 12 and April 1 triggered the K8s E2E path filter.

Evidence

• Last successful run (March 12): https://github.com/vectordotdev/vector/actions/runs/23011032147
• Failing run on PR branch (April 1): https://github.com/vectordotdev/vector/actions/runs/23870687365
• Failing run on master (April 1): https://github.com/vectordotdev/vector/actions/runs/23876760805

Possibly related

• chore(api)!: replace GraphQL observability API with gRPC, remove async-graphql dependencies #24364
• fix(buffers): Reverse performance regression in buffer metrics #24995 (comment)