Change cron schedule of github actions

[harishxr]

Summary

• Change the cron schedule of github actions to run at 6PM UTC from Mon - Fri instead of running only on Tuesdays at 6PM UTC

Implementation details

Testing

• Verified cron expression using https://crontab.guru/#0_18_*_*_1-5

New tests cover the changes:

Description for the changelog

Licensing

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.