JSON grammar without filePath parsed incorrectly as PList

[zm-cttae]

  2) test/api/tokenInformation.test.ts (src/api.ts)
       getScopeRangeAtPosition(): Promise<TextmateToken>:
     Error: Near offset 1: expected < ~~~"name":"Plain Text","scopeName":"text","patterns":~~~

• https://github.com/vsce-toolroom/vscode-textmate-languageservice/actions/runs/6524918551/job/17717050647?pr=51

This is happening because JSON support is hacked in for JSON file URIs, but not JSON content values:

vscode-textmate/src/parseRawGrammar.ts

Lines 11 to 13 in 8b07a3c

	if (filePath !== null && /\.json$/.test(filePath)) {
	return parseJSONGrammar(content, filePath);
	}