Use smaller requests for TestIngester_inflightPushRequests

[bboreham]

What this PR does

The amount of data required to process for 1 second may be very large - it crashes my desktop which has a very fast processor.
Reducing the target duration to 1/10th of a second allows the test to work with much less resource.

Checklist

• Tests updated.
• NA Documentation added.
• NA CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX].
• NA about-versioning.md updated with experimental features.

[pstibrany]

lgtm. Hopefully it won't make test more flaky on slow machines. 🤞

[bboreham]

Updated after #7621 which moved some things around.
Update again: trying 250ms since 100ms failed in CI.

Current main:

$ /bin/time go test -count 1 -tags stringlabels -run 'inflightPushRequests' ./pkg/ingester/
ok      github.com/grafana/mimir/pkg/ingester   36.146s
46.19user 6.75system 0:37.24elapsed 142%CPU (0avgtext+0avgdata 17431944maxresident)k
24inputs+2003640outputs (13837major+329096minor)pagefaults 0swaps

This PR:

$ /bin/time go test -tags stringlabels -run 'inflightPushRequests' ./pkg/ingester/
ok      github.com/grafana/mimir/pkg/ingester   (cached)
0.92user 0.43system 0:00.48elapsed 280%CPU (0avgtext+0avgdata 93880maxresident)k

17GB -> 93MB

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[github-actions]

This pull request has been closed because it has been stale for 30 days with no activity. Feel free to reopen if you want to continue working on this.