Fix PHPUnit shim arg parsing for DB test runner (--dsn with space-separated value)

[Copilot]

The Database tests (mysql, PHP 8.3) workflow fails before test execution because the legacy PHPUnit command shim forwards --dsn to PHPUnit 11 as an unknown option. The failure is triggered by tests/runtests.php --dsn <value> (space-separated form), which the shim did not consume.

• Root cause

  • PHPUnit_TextUI_Command shim in tests/bootstrap.php only handled:
    • --opt=value
    • --flag
  • It did not handle --opt value for options declared with = (e.g. dsn=), so --dsn leaked to PHPUnit.

• Change: shim option parser

  • Reworked run() argument iteration to index-based parsing.
  • Added handling for long options with required values in both forms:
    • --dsn=value
    • --dsn value
  • Existing flag behavior (e.g. --db-per-test) remains unchanged.

• Change: focused regression coverage

  • Added tests/tests/lib/ezutils/PHPUnitTextUICommandShimTest.php.
  • Covers both accepted --dsn forms and asserts the option is consumed by the shim (not treated as unknown by PHPUnit).

if ( str_ends_with( $opt, '=' ) && $arg === "--{$key}" && ( $index + 1 ) < $argc )
{
    $value = $argv[$index + 1];
    $this->$handler( $value );
    $index += 2;
    continue 2;
}