chore: remove json schema from source control (#5420)

.gitignore

@@ -14,3 +14,4 @@ renovate-0.0.0-semantic-release.tgz
 .eslintcache
 junit.xml
 /test-results
+renovate-schema.json

test/json-schema.ts

 import shell from 'shelljs';
 
 shell.exec('yarn create-json-schema');
-
-const res = shell.exec('git status --porcelain', { silent: true });
-
-if (res.code === 0 && !res.includes('renovate-schema.json')) {
-  shell.echo('PASS: renovate-schema.json is up to date');
-  shell.exit(0);
-} else {
-  shell.echo(
-    "ERROR: renovate-schema.json needs updating. Run 'yarn create-json-schema' and commit."
-  );
-  shell.exit(-1);
-}