file_icons: Add Stylelint file icon associations (#24605)

This PR adds file associations for stylelint files.

This is how it looks like in Zed (the icon doesn't exist):
![default javascript file icon is shown for
stylelint.config.js](https://github.com/user-attachments/assets/a873d7fc-1b8a-4a9c-8e92-1be56d5b01b1)

In a dev version of an icon theme it looks like this (icon sourced from:
https://github.com/vscode-icons/vscode-icons/blob/master/icons/file_type_stylelint.svg
):
![stylelint file icon is shown for
stylelint.config.js](https://github.com/user-attachments/assets/ddbb068d-7986-43de-94f8-9c844cb6b96f)

Release Notes:

- Icon themes: Added Stylelint file icon associations.

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>

assets/icons/file_icons/file_types.json

@@ -190,6 +190,17 @@
     "sh": "terminal",
     "sql": "storage",
     "sqlite": "storage",
+    "stylelint.config.cjs": "stylelint",
+    "stylelint.config.js": "stylelint",
+    "stylelint.config.mjs": "stylelint",
+    "stylelintignore": "stylelint",
+    "stylelintrc": "stylelint",
+    "stylelintrc.cjs": "stylelint",
+    "stylelintrc.js": "stylelint",
+    "stylelintrc.json": "stylelint",
+    "stylelintrc.mjs": "stylelint",
+    "stylelintrc.yaml": "stylelint",
+    "stylelintrc.yml": "stylelint",
     "svelte": "svelte",
     "svg": "image",
     "swift": "swift",