[Failed-Request-Alert-Tuning] Assign Appropriate HTTP Status Code for Immature Records error

[quiet-node]

Description

The error caused by immature records in the Mirror Node (MN) is currently returning an HTTP 500 status code. This triggers the failed-request-too-high alerts unnecessarily, making it difficult to identify and prioritize critical issues. Since this scenario is expected behavior and not indicative of a server error, it should use a more appropriate HTTP status code.

This change will ensure that alerts are only triggered for critical issues while maintaining visibility of immature record occurrences through metrics for observability.

Solution
• Define a dedicated error type specifically for scenarios involving immature records.
• Update the HTTP status code for the “immature records found” error to 502 (Bad Gateway) instead of 500.