fix(studio): use postgres user for read write operations

[singh-inder]

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

studio sends its own connection string to pgmeta for executing queries via studio sql-editor. It defaults to supabase_admin user. https://github.com/supabase/supabase/blob/18cc6f8fe9654e0b682d4f6564adc838977d197e/apps/studio/lib/api/self-hosted/constants.ts#L8

What is the new behavior?

Use postgres user for studio read write operations

[coveralls]

Pull Request Test Coverage Report for Build 21817338223

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 57.84%

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Files with Coverage Reduction	New Missed Lines	%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 21817171276:	-0.02%
Covered Lines:	7455
Relevant Lines:	12889

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💛 - Coveralls