Address multi value aggregation keys for reporting

[Fajfa]

The following changes are implemented

TODO: Summary

Changes in the user interface:

TODO: Add screenshots, recordings or remove this section

Checklist when submitting a final (!draft) PR

• Commits are tidied up, squashed if needed and follow guidelines in CONTRIBUTING.md
• Code builds
• All existing tests pass
• All new critical code is covered by tests
• PR is linked to the relevant issue(s)
• Rebased with the target branch

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ runtime.boundsError: runtime error: index out of range [-1] GET /api/compose/namespace/402510356586037249/m... View Issue

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