fix: fix MetricsAggregator check for metric sameness #11508
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Fixes #11451
A refactor of the Agent API passes metrics as protobufs, which include pointers to label name/value pairs. The aggregator tested for sameness by doing a shallow compare of label values, which for different stats reports would compare unequal because the pointers would be different.
This fix does a deep compare.
While testing I also noted that we neglect to compare template names. This is unlikely to have caused any issue in practice, since the combination of username/workspace is unique, but in the context of comparing metric labels we should do the comparison.
If a user creates a workspace, deletes it, then recreates from a different template, we could in principle have reported incorrect stats for the old template.