Fix warning when test OTP is enabled but SMS provider is not configured

[Rooffeell]

What kind of change does this PR introduce?

• Bug fix

What is the current behavior?

When test OTP is enabled without an SMS provider configured, the CLI shows the warning:
"WARN: no SMS provider is enabled. Disabling phone login."

This can be confusing for users trying to test OTP flows.

What is the new behavior?

• The CLI now handles the scenario gracefully:
  • Test OTP can be enabled without requiring an SMS provider.
  • Warning is only shown when relevant to misconfigured production providers.

Additional context

This improves the developer experience when using test OTP flows in Supabase CLI.

[coveralls]

Pull Request Test Coverage Report for Build 20796811620

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 7 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.03%) to 56.016%

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Files with Coverage Reduction	New Missed Lines	%
internal/storage/rm/rm.go	2	80.61%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 20786687458:	-0.03%
Covered Lines:	6848
Relevant Lines:	12225

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💛 - Coveralls