Sourcing native_mariadb_port_takeover.sh for unit tests means a failing
check's die() -> exit 1 would terminate the sourcing test script itself
rather than just failing an `if` condition. Wrap the three
expected-to-fail calls in subshells so exit is confined to the subshell.
Documents the approved design for restoring "grant access to every
owned database" behavior specifically for the top-nav PHPMYADMIN
button, while keeping the per-row "Zaloguj do bazy" button scoped to
one database.
Marek Miklewicz