[Voyager] Remove the check for pg_stat_statements being loaded via shared_preload_libraries

[shubham-yb]

Jira Link: DB-14190

Description

In the current implementation we are using the query SELECT current_setting('shared_preload_libraries') to figure out if pg_stat_statements is loaded via shared_preload_libraries.

The Voyager user does not have the privilege to run the above query and thus we always get the guardrails warning

pg_stat_statements is not loaded via shared_preload_libraries, required for detecting Unsupported Query Constructs

Even if the configuration is correct.

We need to remove this check so that user does not face this false negative.

Issue Type

kind/bug

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