chore(cli): remove unused coveragePathIgnorePatterns from @backstage/cli

The __fixtures__ directory that required this exclusion was moved to
@backstage/cli-module-build.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Fredrik Adelöw <freben@spotify.com>

packages/cli/package.json

@@ -41,11 +41,6 @@
     "ext": "ts",
     "watch": "./src"
   },
-  "jest": {
-    "coveragePathIgnorePatterns": [
-      "/__fixtures__/"
-    ]
-  },
   "dependencies": {
     "@backstage/cli-common": "workspace:^",
     "@backstage/cli-defaults": "workspace:^",