build(aio): don't constrain checkContentRules to run before another processor (#24000)

We don't really care when this processor runs as long as it happens
after the tags have been extracted.
By not constraining its `runBefore` property we can ensure that other
processors can be run before it.

PR Close #24000

aio/tools/transforms/angular-base-package/processors/checkContentRules.js

@@ -32,7 +32,7 @@ module.exports = function checkContentRules(log, createDocMessage) {
     docTypeRules: {},
     failOnContentErrors: false,
     $runAfter: ['tags-extracted'],
-    $runBefore: ['processing-docs'],
+    $runBefore: [],
     $process(docs) {
       const logMessage = this.failOnContentErrors ? log.error.bind(log) : log.warn.bind(log);
       const errors = [];