test_compatibility: fix pg_tenant_only_port port collision

[bayandin]

Problem

Compatibility tests fail from time to time due to pg_tenant_only_port port collision (added in #4731)

Ref https://neondb.slack.com/archives/C033RQ5SPDH/p1690798232756869

Summary of changes

• replace pg_tenant_only_port value in config with new port: e0f1cc4
• remove old logic, than we don't need anymore: 88fa602
• unify config overrides: 705a5c5

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]

1240 tests run: 1189 passed, 0 failed, 51 skipped (full report)

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