6.0.4
[5.4] Add mysql to test matrix and proper min max db versions (#46186)
Merge remote-tracking branch 'upstream/5.4-dev' into upmerges/2026-02-06-2
Merge branch '5.4-dev' into 6.0-dev-upmerge-2026-02-18
Move API system tests to cypress (#40135)
Update tests/README.md (#43487)