feat(SPV-1478): migrate existing admin v2 endpoints to openapi3

[pawellewandowski98]

Description

• Migrate existing admin v2 endpoints to openapi3 implementation

Warning

Remember to regenerate swagger when #898 is merged

Pull Request Checklist

• 📖 I created my PR using provided : CODE_STANDARDS
• 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• 🏠 I tested my changes locally.
• ✅ I have provided tests for my changes.
• 📝 I have used conventional commits.
• 📗 I have updated any related documentation.
• 💾 PR was issued based on the Github or Jira issue.

[github-actions]

Manual Tests

💚 Manual testing by @dorzepowski resulted in success.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 43.26531% with 139 lines in your changes missing coverage. Please review.

Project coverage is 53.05%. Comparing base (c72a4cf) to head (0b22239).

Files with missing lines	Patch %	Lines
api/gen.models.go	0.00%	104 Missing ⚠️
api/gen.api.go	76.66%	10 Missing and 4 partials ⚠️
server/server.go	0.00%	9 Missing ⚠️
tools/merge_yamls.go	0.00%	5 Missing ⚠️
actions/v2/admin/users/create.go	75.00%	3 Missing and 1 partial ⚠️
actions/v2/admin/users/paymail_add.go	89.47%	1 Missing and 1 partial ⚠️
actions/v2/admin/users/get.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #899      +/-   ##
==========================================
- Coverage   53.25%   53.05%   -0.21%     
==========================================
  Files         412      409       -3     
  Lines       18359    18498     +139     
==========================================
+ Hits         9778     9815      +37     
- Misses       7815     7913      +98     
- Partials      766      770       +4     

Flag	Coverage Δ
unittests	53.05% <43.26%> (-0.21%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
actions/v2/admin/internal/mapping/paymail.go	100.00% <100.00%> (ø)
actions/v2/admin/internal/mapping/user.go	100.00% <100.00%> (ø)
actions/v2/admin/server.go	100.00% <100.00%> (ø)
actions/v2/admin/status.go	100.00% <100.00%> (ø)
actions/v2/admin/users/server.go	100.00% <100.00%> (ø)
actions/v2/base/server.go	100.00% <100.00%> (ø)
actions/v2/base/shared_config.go	100.00% <100.00%> (ø)
actions/v2/register.go	100.00% <100.00%> (ø)
actions/v2/server.go	100.00% <100.00%> (ø)
actions/v2/swagger/swagger-ui.go	62.50% <ø> (ø)
... and 7 more

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