Add inbound token access feature - UI

What does this MR do and why?

This MR adds the ability in the UI to allow certain projects access to your project by a CI_JOB_TOKEN. This code is behind the feature flag :ci_inbound_job_token_scope.

Things to note while reviewing this MR...

1. The code is written in a way so we can easily remove the outbound access in %16.0
2. The inbound_token_access.vue component is essentially a carbon copy of the outbound component. Just some copy changes and mutation/query structure changes.
3. You'll see some code repeated, but this is okay. Since we will be removing the outbound logic in an upcoming milestone.
4. At first I didn't know we were removing the feature completely, so I tried to open an MR that made the two live together a little more nicely. But it's not needed anymore...

Screenshots or screen recordings

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How to set up and validate locally

1. Enable the flag Feature.enable(:ci_inbound_job_token_scope)
2. Project > Settings > CI/CD > Token Access

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #375782 (closed)