Update test-rc job schedule to run only once at midnight

[pankajkoti]

This is with an intent to save some costs and running once at midnight should be sufficient.

[pankajastro]

I think earlier it was once in 24hr but we changed since for rc2 etc we get 24hr

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.33%. Comparing base (989a15c) to head (a9c128b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1505   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files          94       94           
  Lines        4636     4636           
=======================================
  Hits         4559     4559           
  Misses         77       77           

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