Merging latest development commits

[bachtran02]

Changes Summary:

Changes in email.py

• replace hardcoded STMP server credentials with environment variables configured in Cloud Run.
• emails are now sent correctly so cleaned up commented-out code.

Added course name and assignment title to assignment extension logging.

Course name can be configured with key COURSE_NAME in Spreadsheet Environment Variables sheet.
It is defaulted to empty string if not configured.

Documentation in Extension Request

Documentation info is added to Slack message if provided by student.

service-account.json

In Cloud Source repo, service-account.json file is included directly in the repo so that the functions can access the spreadsheets. This credential file has been moved to Google Secret Manager and mounted to the Cloud Run functions at /var/secrets/service-account-json at runtime. Existing staging functions have been configured to handle this.

All changes to hide credentials/private data is meant to be carried out on developer's side. People who create copy of spreadsheet for courses (e.g TAs) should not worry about any of these.

Testing

Updates to testing functions to dynamically test if policy.apply() works correctly.