Fix assertion in GiteaClientTest.Get_StarredRepos_Ok test

[coderabbitai]

Description

The test Get_StarredRepos_Ok() in GiteaClientTest currently asserts on the mock input data instead of the actual method result returned by GetStarred().

Location

File: src/Designer/backend/tests/Designer.Tests/Clients/Gitea/GiteaClientTest.cs

Context

This issue was identified during the review of PR #17092 but was deferred to maintain PR scope.

References

• PR: refactor: gitea client #17092
• Comment: refactor: gitea client #17092 (comment)
• Requested by: @HauklandJ