gfcs-auto-chained-select.php: Migrating from experimental folder.

[spivurno]

https://www.notion.so/gravitywiz/Gravity-Wiz-Gravity-Forms-Chained-Selects-Auto-Select-Only-Option-15200ab68edf80fc87b1d03d58823c4a?pvs=4

[github-actions]

	Fails
🚫	Please include a description of your PR changes so our future selves are thankful of our past selves. 😃
🚫	Pull request title does match the correct format. The Pull Request title should match our Snippet Library Pull Request Title Guidelines in Notion.
🚫	Commit message 'gfcs-auto-chained-select.php: Migrating from experimental folder.' does match the correct format. See our Snippet Library Commit Messages Guidelines in Notion.
🚫	gravity-forms/gfcs-auto-chained-select.php: it looks like this file does not have the appropriate snippet header.

	Messages
📖	Merlin would give this scroll the highest of praises. Cheers for adding this new snippet to the library! 🪄

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