Repro steps

1. Click on a multi-branch pipeline to view Activity
2. Click on a run from a branch that has special characters in its name (e.g. "feature/UX-123") and is far enough down the page
3. Close run details

Expected behavior

• Run Details modal should close, and the Activity table should be scrolled down so that the branch is scrolled as close to the top of the page as possible

Actual behavior

• Run Details modal closes
• Scroll position is always set to the top

Impl Notes

• I'm guessing we may need to URI-encode the branch name / run number that appears after the hash in order for this work nicely.