perf(tests): enforce PHPUnit time limits with sensible timeout values

[miaulalala]

Summary

• Adds enforceTimeLimit="true" and defaultTimeLimit="300" to both phpunit-autotest.xml and phpunit-autotest-external.xml
• Reduces timeout values from the blanket 900s default to 60s / 300s / 600s for small / medium / large annotated tests
• Adds ini-values: disable_functions="" to all phpunit workflow files that use ini-file: development
• Reduces DB inserts in AbstractMappingTestCase::testGetListOfIdsByDn from 3,332 to 14

Why

The timeoutForSmallTests/Medium/Large attributes had no effect because enforceTimeLimit was never set to true. A hanging test could silently block a CI job for up to 15 minutes before the runner-level timeout kicked in.

On defaultTimeLimit: Nearly all existing tests have no size annotation (#[Small]/#[Medium]/#[Large]). Without defaultTimeLimit, PHPUnit 10 falls back to a 1-second default for unannotated tests, which broke the entire suite. Setting defaultTimeLimit="300" is an intentional safety net: it delivers the primary value of this change (hung tests cut at 5 min instead of 15) without requiring a mass annotation effort upfront.

Annotating tests with explicit sizes is better done incrementally — when a test is being modified, the author adds #[Small] or #[Large] as appropriate. This PR establishes the framework; annotation coverage can grow naturally from here.

On ini-values: disable_functions="": PHP's development ini preset disables pcntl_signal via disable_functions. PHPUnit's enforceTimeLimit relies on pcntl_signal to interrupt hung tests; without it, PHPUnit emits a runner-level warning ("pcntl extension required for enforcing time limits"). Because our workflows pass --fail-on-warning, that warning fails the entire job. Clearing disable_functions with ini-values: disable_functions="" re-enables pcntl_signal so enforcement actually works and the warning is suppressed.

On testGetListOfIdsByDn: The test intentionally uses 66,640 DNs (just over PostgreSQL's 65,535-value IN list limit) to verify that getListOfIdsByDn() correctly chunks and merges queries. However, it was also mapping every 20th DN, resulting in 3,332 DB inserts — far more than needed to verify the chunking behaviour. Reduced to every 5,000th DN (14 inserts) which still crosses the chunk boundary and validates the merge logic, but runs in a fraction of the time on slow backends like Oracle.

Notes

• If CI surfaces further tests that legitimately exceed 300s, annotate them #[Large] rather than raising the default

Test plan

• Verify no unexpected TimeoutException failures across all PHPUnit jobs
• Confirm the "pcntl extension required" warning no longer appears in any job
• Check all jobs pass cleanly end-to-end

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