test_compatibility: fix the regexes detecting the version

[a-masterov]

Problem

The Neon components, built locally and by the GitHub workflow have slightly different version prefixes (git: vs git-env:)
This does not allow running tests against local builds correctly.

Summary of changes

The regular expressions were changed to work with the both version prefixes.

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]

5013 tests run: 4855 passed, 0 failed, 158 skipped (full report)

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Flaky tests (2)

Postgres 16

• test_subscriber_restart: release-x86-64

Postgres 15

• test_replica_start_scan_clog_crashed_xids: release-arm64

Code coverage* (full report)

• functions: 31.5% (7488 of 23798 functions)
• lines: 49.8% (60110 of 120696 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
e768f26 at 2024-09-30T14:17:01.553Z :recycle:}