JetBrains: Rename RepoIcon to CodeHostIcon

Created by: philipp-spiess

This fixes an issue added by missing to apply #35891 inside the JetBrains code.

I have only merged the changes to run JetBrains code in our CI today so this slipped through yesterday.

Test plan

The codebase builds again.

[10:44:06] Finished 'webpack' after 36 s
✨  Done in 37.81s.

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