Add .gql and .graphqls extensions for GraphQL icon (#12073)

There are `.gql` and `.graphqls` suffix support in [GraphQL VSCode
extension](https://marketplace.visualstudio.com/items?itemName=GraphQL.vscode-graphql-syntax).
I use those file extensions in my projects, hence I wanted them to be
graphql icons.

Release Notes:

- Added GraphQL icon for `.gql` and `.graphqls` files.

currently:

![resim](https://github.com/zed-industries/zed/assets/1047345/4c333129-00cc-401a-88e6-fd44f74caea3)

after this pr:

![resim](https://github.com/zed-industries/zed/assets/1047345/103a0b5a-1c8b-4dea-998c-e768940887c4)

in vscode:

![resim](https://github.com/zed-industries/zed/assets/1047345/29f438d6-ff9e-4a95-8ef2-e5d8d27c0fe9)

assets/icons/file_icons/file_types.json

@@ -57,7 +57,9 @@
     "gitkeep": "vcs",
     "gitmodules": "vcs",
     "go": "go",
+    "gql": "graphql",
     "graphql": "graphql",
+    "graphqls": "graphql",
     "h": "c",
     "hpp": "cpp",
     "handlebars": "code",