fix: ensure that EnvInfo stays constant between metric exports

[igorbernstein2]

The previous metrics refactor accidentally recomputed the uuid for metrics labels for each export, causing each export to create a new stream

Change-Id: I14e7cfb691750c4017b65e09c58bf8b729e625c3

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)
• Rollback plan is reviewed and LGTMed
• All new data plane features have a completed end to end testing plan

Fixes #<issue_number_goes_here> ☕️

If you write sample code, please follow the samples format.