proxy: Exclude compute and retries

[khanova]

Problem

Alerts fire if the connection the compute is slow.

Summary of changes

Exclude compute and retry from latencies.

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics? if so did you add the relevant metrics to the dashboard?
• If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section.

Checklist before merging

• Do not forget to reformat commit message to not include the above checklist

[github-actions]

2796 tests run: 2675 passed, 0 failed, 121 skipped (full report)

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Flaky tests (1)

Postgres 15

• test_gc_of_remote_layers: debug

Code coverage* (full report)

• functions: 28.3% (6547 of 23143 functions)
• lines: 47.0% (46255 of 98502 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
fc1143d at 2024-04-28T12:46:57.622Z :recycle:}