chore: integration test base

[muhlemmer]

Add integrations tests for the gRPC API, primarily targeted at v2 but can also be used for legacy. Provides a crude framework that runs a server, prepares a client and exposes the underlying resources such as command and query handlers to the tester. The code in internal/integration is written just as a proof of concept and probably needs to be split up in more reusable chunks when we need more functionality, like multiple users, organisations, instances etc.

Integrations tests for user/v2alpha are also included.

See the added documentation for more details.

Definition of Ready

• I am happy with the code
• Short description of the feature/issue is added in the pr description
• PR is linked to the corresponding user story
• Acceptance criteria are met
• All open todos and follow ups are defined in a new ticket and justified
• Deviations from the acceptance criteria and design are agreed with the PO and documented.
• No debug or dead code
• Critical parts are tested automatically
• Where possible E2E tests are implemented
• Documentation/examples are up-to-date
• All non-functional requirements are met
• Functionality of the acceptance criteria is checked manually on the dev system.

Related to #5598

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 4, 2023 7:16am

[codecov]

Codecov Report

Merging #5739 (11f0f54) into main (991a563) will decrease coverage by 4.02%.
The diff coverage is 44.68%.

@@            Coverage Diff             @@
##             main    #5739      +/-   ##
==========================================
- Coverage   48.42%   44.40%   -4.02%     
==========================================
  Files         693     1173     +480     
  Lines       72237   103086   +30849     
==========================================
+ Hits        34981    45778   +10797     
- Misses      35620    55159   +19539     
- Partials     1636     2149     +513     

Impacted Files	Coverage Δ
cmd/setup/03.go	0.00% <0.00%> (ø)
cmd/setup/10.go	0.00% <0.00%> (ø)
cmd/setup/config.go	0.00% <ø> (ø)
cmd/setup/config_change.go	0.00% <0.00%> (ø)
internal/api/grpc/admin/export.go	0.00% <0.00%> (ø)
internal/api/grpc/auth/user_grant.go	0.00% <0.00%> (ø)
internal/api/grpc/management/idp_converter.go	9.39% <0.00%> (-0.06%)	⬇️
...i/grpc/management/project_application_converter.go	0.00% <0.00%> (ø)
internal/api/grpc/management/user.go	0.00% <0.00%> (ø)
internal/api/grpc/member/converter.go	0.00% <0.00%> (ø)
... and 49 more

... and 630 files with indirect coverage changes

[github-actions]

🎉 This PR is included in version 2.24.0-ignore-me2.1 🎉

The release is available on GitHub release

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