1. remove "no reply" from sender name and sender email
2. fix related tests
skip persistence check if the delay is set to 0
move emphasis from date/time to timeTaken
Moved BackDoorTest and GodModeTest out of staging tests.
Modifications to tests
[Fixes#75245398] skip persistence check if the delay is set to 0
change sample data googleIds
[Fixes#75250636] sampleData accounts get deleted when tests  are run
Merge branch '74590202' into dev
Merge branch 'master' of https://github.com/TEAMMATES/repo
Merge branch 'dev' into FeedbackSessions
Merge branch 'master' into dev
Merge branch 'dev' into FeedbackSessions
1. add background colour for table cell
Cascade delete instructor/student when deleting accounts
[Fixes#75251114] deleting accounts does not cascade delete student/instructor entities
Merge branch 'FeedbackSessions' into dev
change magic numbers into constant
Merge pull request #2268 from TEAMMATES/Issue2261

adminActivityLog: de-emphasize date/time, emphasize time taken #2261
Merge pull request #2267 from TEAMMATES/Issue2262

remove 'no reply' from TEAMMATES emails #2262