safekeeper: add membership configuration switch endpoint

[arssher]

Problem

#9965

Summary of changes

Add to safekeeper http endpoint to switch membership configuration. Also add it to python client for tests, and add simple test itself.

[github-actions]

7106 tests run: 6768 passed, 34 failed, 304 skipped (full report)

---

Failures on Postgres 17

• test_forward_compatibility: release-x86-64, release-x86-64, debug-x86-64, release-arm64, release-arm64
• test_versions_mismatch[combination_ooonn]: release-x86-64, release-x86-64, debug-x86-64, release-arm64, release-arm64
• test_versions_mismatch[combination_ononn]: release-x86-64, release-x86-64, debug-x86-64, release-arm64, release-arm64
• test_idle_checkpoints: debug-x86-64

Failures on Postgres 16

• test_forward_compatibility: release-x86-64, release-arm64
• test_versions_mismatch[combination_ooonn]: release-x86-64, release-arm64
• test_versions_mismatch[combination_ononn]: release-x86-64, release-arm64

Failures on Postgres 15

• test_forward_compatibility: release-x86-64, release-arm64
• test_versions_mismatch[combination_ooonn]: release-x86-64, release-arm64
• test_versions_mismatch[combination_ononn]: release-x86-64, release-arm64

Failures on Postgres 14

• test_forward_compatibility: release-x86-64, release-arm64
• test_versions_mismatch[combination_ooonn]: release-x86-64, release-arm64
• test_versions_mismatch[combination_ononn]: release-x86-64, release-arm64

# Run all failed tests locally:
scripts/pytest -vv -n $(nproc) -k "test_forward_compatibility[release-pg14] or test_forward_compatibility[release-pg14] or test_versions_mismatch[release-pg14-combination_ooonn] or test_versions_mismatch[release-pg14-combination_ooonn] or test_versions_mismatch[release-pg14-combination_ononn] or test_versions_mismatch[release-pg14-combination_ononn] or test_forward_compatibility[release-pg15] or test_forward_compatibility[release-pg15] or test_versions_mismatch[release-pg15-combination_ooonn] or test_versions_mismatch[release-pg15-combination_ooonn] or test_versions_mismatch[release-pg15-combination_ononn] or test_versions_mismatch[release-pg15-combination_ononn] or test_forward_compatibility[release-pg16] or test_forward_compatibility[release-pg16] or test_versions_mismatch[release-pg16-combination_ooonn] or test_versions_mismatch[release-pg16-combination_ooonn] or test_versions_mismatch[release-pg16-combination_ononn] or test_versions_mismatch[release-pg16-combination_ononn] or test_forward_compatibility[release-pg17] or test_forward_compatibility[release-pg17] or test_forward_compatibility[debug-pg17] or test_forward_compatibility[release-pg17] or test_forward_compatibility[release-pg17] or test_versions_mismatch[release-pg17-combination_ooonn] or test_versions_mismatch[release-pg17-combination_ooonn] or test_versions_mismatch[debug-pg17-combination_ooonn] or test_versions_mismatch[release-pg17-combination_ooonn] or test_versions_mismatch[release-pg17-combination_ooonn] or test_versions_mismatch[release-pg17-combination_ononn] or test_versions_mismatch[release-pg17-combination_ononn] or test_versions_mismatch[debug-pg17-combination_ononn] or test_versions_mismatch[release-pg17-combination_ononn] or test_versions_mismatch[release-pg17-combination_ononn] or test_idle_checkpoints[debug-pg17]"

Flaky tests (2)

Postgres 15

• test_pgdata_import_smoke[None-1024-RelBlockSize.MULTIPLE_RELATION_SEGMENTS]: release-arm64

Postgres 14

• test_emergency_mode: release-arm64

Test coverage report is not available

_{The comment gets automatically updated with the latest test results
0f2c8d9 at 2024-12-25T14:26:11.971Z :recycle:}