Migrate snippet form to formik (#26928)

* Add `NativeQuerySnippet` type

* Add `NativeQuerySnippet` mocks

* Add `snippets` to entities store type

* Add `SnippetCollectionName` component

* Support snippet folders in `FormCollectionPicker`

* Add `SnippetForm`

* Add `SnippetFormModal`

* Use new `SnippetFormModal`

* Remove `SnippetModal`

* Fix initial values formatting

* Ensure errors are displayed

* Simplify archive button

* Remove commented out code

* Detach entity loader props from own props

* Add unit tests

* Fix test names

* Fix modal props usage

* Use `NativeQuerySnippetId` type

* Make description field nullable

* Fix `FormTextArea` styling