Improve rerun test

for troubleshooting TNL-692
Add email template for verified certificate date
Merge pull request #5765 from edx/carol/docs/DOC-1100

Add email template for verified certificate date
Merge pull request #5724 from edx/zoldak/improve-rerun-test

Improve rerun test
Commenting out flaky string input test case
Merge pull request #5803 from Stanford-Online/caijim/resetbutton

Commenting out flaky string input test case