proxy: locked is not retriable

[conradludgate]

Problem

Management service returns Locked when quotas are exhausted. We cannot retry on those

Summary of changes

Makes Locked status unretriable

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics? if so did you add the relevant metrics to the dashboard?
• If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section.

Checklist before merging

• Do not forget to reformat commit message to not include the above checklist

[conradludgate]

We should probably update this error message

neon/proxy/src/console/provider.rs

Lines 65 to 68 in d11621d

	http::StatusCode::LOCKED => {
	// Status 423: project might be in maintenance mode (or bad state).
	format!("{REQUEST_FAILED}: endpoint is temporary unavailable")
	}

It's not very useful for the end user

[github-actions]

1624 tests run: 1550 passed, 0 failed, 74 skipped (full report)

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_{The comment gets automatically updated with the latest test results
9c3c885 at 2023-08-31T12:35:46.934Z :recycle:}

[vadim2404]

Typo: contact should be