The shortcode_gmap Drupal 12 port

Dénes Szabórequested to merge
issue/shortcode_gmap-3623466:3623466-port-shortcode-gmap into 7.x-1.x

Full-module verification (module enable, 23 unit+kernel tests, phpcs, phpstan, manual smoke test) passed. Only real finding was phpcs Drupal.Commenting.DocComment: missing doc comments on test methods and the GmapShortcodeTest class in tests/src/Unit/GmapShortcodeTest.php and tests/src/Kernel/ShortcodeGmapKernelTest.php. Added minimal doc comments describing each test's intent; no behavioral changes.

Closes #3623466

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