Migrate system tests to use GRPC V2 API

[fasmat]

Motivation

System tests still use the v1 API. I migrated the tests to instead use the V2 API where possible.

Closes #6692

TODO: there appear to be issues with the v2beta1 and v2alpha1 APIs regarding streaming of layers. To avoid putting too much effort into this I'll put this into draft for now and will take another look later.

Description

All tests where migrated to use v2 APIs over v1 APIs. The only requests not yet migrated are proposal streams since those aren't available in v2 (and probably won't ever be). We should consider implementing those tests in a different way.

Additionally I moved the v1 API into its own package api/grpcserver/v1 instead of having it in the shared api/grpcserver package. This will make it easier in the future to deprecate / remove this code.

Test Plan

All system tests still pass as before.

TODO

• Explain motivation or link existing issue(s)
• Test changes and document test plan
• Update documentation as needed
• Update changelog as needed

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[codecov]

Codecov Report

Attention: Patch coverage is 41.07143% with 33 lines in your changes missing coverage. Please review.

Project coverage is 79.8%. Comparing base (20fd927) to head (63d37de).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
api/grpcserver/v2alpha1/layer.go	25.0%	14 Missing and 1 partial ⚠️
api/grpcserver/v2beta1/layer.go	25.0%	14 Missing and 1 partial ⚠️
sql/layers/layers.go	0.0%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #6696     +/-   ##
=========================================
- Coverage     79.8%   79.8%   -0.1%     
=========================================
  Files          366     366             
  Lines        50006   50005      -1     
=========================================
- Hits         39941   39936      -5     
- Misses        7799    7801      +2     
- Partials      2266    2268      +2     

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