Fix the connection error for extension tests

[a-masterov]

Problem

The trust connection to the compute required for pg_anon was removed.
However, the PGPASSWORD environment variable was not added to docker-compose.yml.
This caused connection errors, which were interpreted as success due to errors in the bash script.

Summary of changes

The environment variable was added, and the logic in the bash script was fixed.

[github-actions]

7396 tests run: 7011 passed, 0 failed, 385 skipped (full report)

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Flaky tests (3)

Postgres 17

• test_metrics_normal_work: release-x86-64, release-arm64

Postgres 14

• test_metrics_normal_work: release-x86-64

Code coverage* (full report)

• functions: 33.5% (8457 of 25279 functions)
• lines: 49.2% (70935 of 144156 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
2f028e7 at 2025-01-22T16:44:00.209Z :recycle:}