roachtest: collect qps metrics over longer window in gracefuldrain test

[arulajmani]

The gracefuldrain test was modernized in cf30717. Prior to that commit, QPS metrics were collected over a 10s interval, whereas the modernization refactor changed this to 1 second intervals. Looking at a few recent test failures, I see QPS metrics above the failure threshold, which makes me think suspect that this 1s interval is causing the sorts of inaccuracies MeasureQPS warns against. Also See #133020 (comment).

One thing that doesn't line up is the timeline of this tests failure and cf30717. Still, this patch changes the metric's interval back to 10s.

References #133020

Release note: None

[cockroach-teamcity]

This change is 

[arulajmani]

Thanks!

bors r+

[craig]

Build succeeded:

• docker_image_amd64
• local_roachtest
• linux_amd64_fips_build
• acceptance
• macos_amd64_build
• linux_arm64_build
• local_roachtest_fips
• unit_tests
• lint
• macos_arm64_build
• check_generated_code
• linux_amd64_build
• windows_build
• examples_orms

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