fix: Update ORA notification display title

[hassan-raza-1]

Description

This PR updated the preference label from "ORA new submissions" to: "New ORA submission for staff grading" for clarity and consistency.

How Has This Been Tested?

1. Verify On account preferences page the preference label for "ORA new submissions" should now appear as: "New ORA submission for staff grading".

Jira Ticket

https://2u-internal.atlassian.net/browse/INF-1376

Screenshots/sandbox (optional):

Include a link to the sandbox for design changes or screenshot for before and after. Remove this section if it's not applicable.

Before	After

Merge Checklist

• If your update includes visual changes, have they been reviewed by a designer? Send them a link to the Sandbox, if applicable.
• Is there adequate test coverage for your changes?

Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/edx-infinity to do it.
• 🎉 🙌 Celebrate! Thanks for your contribution.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.55%. Comparing base (92b7c58) to head (d060741).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1233   +/-   ##
=======================================
  Coverage   58.55%   58.55%           
=======================================
  Files         119      119           
  Lines        2413     2413           
  Branches      665      667    +2     
=======================================
  Hits         1413     1413           
  Misses        934      934           
  Partials       66       66           

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