Add expand/collapse all for Dag Run conf JSON in Dag Runs list

[ashutosh264]

Add expand/collapse-all controls to the Dag Runs page for conf JSON cells, matching the pattern used on XCom, Events, and Assets.

• Wire ExpandCollapseButtons + useDisclosure so conf cells use collapsed={!open}
• Add one interaction test (mocked RenderedJsonField; localStorage seeds conf column visibility for the test harness)
• Add sample conf to the run_in_range mock handler for that test

related: #68904

[ashutosh264]

Screenshots -

1. Collapse

2. Expand

[bbovenzi]

Care to rebase and see if that solves the CI error?