[DISCO-3008] remove unused accuweather metric emission

[misaniwere]

References

JIRA: DISCO-3008

Description

We no longer use the accuweather.cache.fetch.miss.ttl metric on Grafana so we are removing the emission

PR Review Checklist

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• This PR conforms to the Contribution Guidelines
• The PR title starts with the JIRA issue reference, format [DISCO-####], and has the same title (if applicable)
• [load test: (abort|warn)] keywords are applied (if applicable)
• Documentation has been updated (if applicable)
• Functional and performance test coverage has been expanded and maintained (if applicable)