fix: add deadline date to RAS banner (#4681)

[MillenniumFalconMechanic]

Ticket

• Closes Update RAS transition #4681.

Summary

• Adds the March 25, 2026 deadline date to the RAS banner message for eRA Commons users transitioning to Login.gov

Test plan

• Verify the RAS banner displays the updated text with the deadline date

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This pull request adds a deadline date (March 25, 2026) to the RAS (Researcher Authentication Service) banner message, informing eRA Commons users that they must transition to Login.gov or ID.me credentials by that date to access AnVIL controlled-access data in Terra. This change provides users with a specific timeline for completing the required authentication transition.

Changes:

• Updated the RAS banner text to include the March 25, 2026 deadline for eRA Commons users to transition to Login.gov

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