supabase / supabase / 27761868100

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chore: add feature flag to pretty explain (#47052)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Put Pretty Explain behind a feature flag for experimentation purposes 

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* SQL Editor now supports optional feature controls to conditionally
disable “Explain” functionality. When disabled via configuration, the
“Explain” tab and its entry points are hidden, the EXPLAIN ANALYZE
keyboard shortcut (Ctrl/Cmd+Shift+Enter) is disabled, and any automatic
post-run switch to the Explain tab for EXPLAIN-like queries is
prevented. This also reduces unnecessary mounting of Explain UI content
when turned off.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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