chore: building compute_tools and local_proxy together

[conradludgate]

Problem

Building local_proxy and compute_tools features the same dependency tree, but as they are currently built in separate clean layers all that progress is wasted. For our arm builds that's an extra 10 minutes.

Summary of changes

Combines the compute_tools and local_proxy build layers.

[conradludgate]

Before: 25m7s
After: 12m15s

[github-actions]

7095 tests run: 6797 passed, 0 failed, 298 skipped (full report)

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Flaky tests (2)

Postgres 17

• test_lr_with_slow_safekeeper: release-x86-64
• test_subscriber_synchronous_commit: release-x86-64

Code coverage* (full report)

• functions: 31.3% (8404 of 26881 functions)
• lines: 47.9% (66685 of 139074 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
0000d5e at 2025-01-02T16:12:27.553Z :recycle:}