WIP Adjust timeout thresholds for end to end search test results

What does this MR do?

I've adjusted the timeouts for end to end test search calls to 3 minutes (10 increments of 18 second waits) because according to our severity matrix https://about.gitlab.com/handbook/engineering/development/enablement/search/#severity-labels-for-search-issues-advanced-search-global-search any insert and recall procedure that takes less than 3 minutes is expected normal result.

I've also removed a retrier that wrapped the it clauses in qa/qa/specs/features/ee/browser_ui/enablement/elasticsearch/elasticsearch_reindexing_spec.rb because that test retries search availability three times inside the assert_elasticsearch_responding call in qa/qa/runtime/search.rb and I don't see a need to retry search twice.

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