fix: temp fix to prevent 503 retries on servers page

[IMB11]

Will be completely refactoring pyroServers.ts & pyroFetch.ts in a later PR - it's a mess, some of the options don't work (such as retry: false)

Closes: DEV-19

[Copilot]

Pull Request Overview

This PR implements a temporary fix to prevent retry attempts on 503 status responses on the servers page.

• Removes HTTP status code 503 from the list of retryable status codes.
• Aims to reduce unnecessary retry behavior until a complete refactor is performed.

Comments suppressed due to low confidence (1)

apps/frontend/src/composables/pyroServers.ts:210

• Consider adding an inline comment explaining the removal of 503 from the retryable status codes list for clarity, so future maintainers understand this temporary decision.

const isRetryable = statusCode ? [408, 429, 500, 502, 504].includes(statusCode) : true;

[IMB11]

Replaced by #3745