[UI v2] fix: Create consistent concurrency limit nav title

[devinvillarosa]

1. Updates Concurrency Title to use Breadcrumb component (to be consistent with Variables and Deployments page).
2. Updates nav button to not span across the entire page.

Screen.Recording.2024-12-31.at.9.57.52.AM.mov

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[desertaxle]

LGTM! It looks like we may also want to decrease the size of the global and task run concurrency limit subheaders.