[24.0] Fix contentitem display routing.

[dannon]

Should fix selenium failures in 24.0 and dev.

Also documents the ts-ignore usage more explicitly. We use a custom push method that has a different signature, hence the ts-ignores which can be removed with the migration to vue-router4 and native 'force' arg. I guess we could jump through the hoops to declare the right types here, but the swap to vue-router4 is active in the vue3 branch and very limited, specific, short-lived use of ts-ignore seems fine here.

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• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

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