Bypass min/max queries in usage data queries

What does this MR do?

Part 2 of #325996 (closed)

We recently added an UsageData Queries API for instance admin to pull the queries we run for generating UsagePing. We mention the API in docs

Now, in the implementation of this API, we get the raw SQL queries from the UsageDataQueries Class that override some methods that are used in UsageData class

While reviewing the API implementation, we found that there were some min/max queries that were not required to be executed for the sake of the Queries API. So we had to bypass them and return nil, this is what this MR does.

We moved the methods to Gitlab::Utils::UsageData and override them in lib/gitlab/usage_data_queries.rb as per requirement.

These changes would save us some execution time and respond faster to the API call.

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