Add the tests for the extensions pg_jsonschema and pg_session_jwt

[a-masterov]

Problem

pg_jsonschema and pg_session_jwt are not yet covered by tests

Summary of changes

Added the tests for these extensions.

[github-actions]

8019 tests run: 7635 passed, 0 failed, 384 skipped (full report)

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Flaky tests (3)

Postgres 16

• test_sliding_working_set_approximation: release-x86-64-with-lfc

Postgres 15

• test_sliding_working_set_approximation: release-arm64-with-lfc
• test_timeline_initial_logical_size_calculation_cancellation[timeline_delete]: release-x86-64-with-lfc

Code coverage* (full report)

• functions: 32.3% (8735 of 27049 functions)
• lines: 48.4% (75322 of 155531 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
c28d23d at 2025-03-21T15:47:07.965Z :recycle:}