fix: disabled auto‑mitigation and adjusted 4xx/5xx alert rules

[nc-shahidazim]

Description

This update disables auto‑mitigation for HTTP error alerts and adjusts the 4xx and 5xx alert rules so they trigger when the total count is ≥ 1. It also aligns alert severity so that 5xx errors are reported as Error and 4xx errors as Warning.

What’s included

• Auto‑mitigation disabled for all HTTP-related alert rules.
• Threshold updated to fire when total ≥ 1 for both 4xx and 5xx.
• HTTP 5xx alerts set to Severity = Error.
• HTTP 4xx alerts set to Severity = Warning.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.