Codemods: Remove one-shot Tooltip migration codemod (#78669)

The codemod was introduced in #78411 to assist the 5-PR migration of
the `Tooltip` component from `@wordpress/components` to `@wordpress/ui`
(#78411, #78466, #78470, #78691, #78692). With the migration complete,
the codemod has no remaining utility.

The `tools/codemods/` directory is removed entirely because no other
codemods remained.

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Co-authored-by: ciampo <mciampini@git.wordpress.org>
Co-authored-by: manzoorwanijk <manzoorwanijk@git.wordpress.org>

Author: ciampo