[8.x](backport #3986) Add timeout to bulker flush, add default case in failQueue #4172
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What is the problem this PR solves?
Scale tests are often blocked at flushing the bulker queue.
How does this PR solve the problem?
Adding a context timeout to the bulker flush so it times out if it takes more time than the deadline.
How to test this PR locally
Ran scale tests here: https://buildkite.com/elastic/observability-perf/builds?branch=increase-poll-action-retries-for-agent-upgrades
Design Checklist
Checklist
./changelog/fragments
using the changelog toolRelated issues
Relates https://github.com/elastic/ingest-dev/issues/3783
This is an automatic backport of pull request #3986 done by Mergify.