2687 Added email text for sendgrid

[raftmsohani]

Summary of Changes

Pull request closes #2687 _

Email task needs to send html content to admin users. When sending html, django email also has to submit text content since Sendgrid email service doesn't accept empty text email.

How to Test

In develop branch:

cd tdrs-frontend && docker-compose -f docker-compose.yml -f docker-compose.local.yml up -d
cd tdrs-backend && docker-compose -f docker-compose.yml -f docker-compose.local.yml up -d 

1. Change email cron job to run every minute in settings by changing minutes and hours to '*'
2. Open http://localhost:3000/ and sign in.
3. Login to admin and assign yourself as admin
4. Verify that email task runs everyminute and you cannot receive email.

Change your branch to current PR branch and verify you can receive the email.

Deliverables

More details on how deliverables herein are assessed included here.

Deliverable 1: Accepted Features

Checklist of ACs:

• [x] OFA System Admin and OFA Admin receives one email per day (ideal run time between 0100-0200 UTC) presenting a count of all users with an "Access Request" status as of that day. Prototype in notes. -[ ] Django Admin console has additional filter to show timestamp of when a user's status changed to, "Access request" not needed
• [x] Testing Checklist has been run and all tests pass
• [ ] README is updated, if necessary
• [x] lfrohlich and/or adpennington confirmed that ACs are met.

Deliverable 2: Tested Code

• Are all areas of code introduced in this PR meaningfully tested?
  • [x] If this PR introduces backend code changes, are they meaningfully tested?
  • [ ] If this PR introduces frontend code changes, are they meaningfully tested?
• Are code coverage minimums met?
  • [ ] Frontend coverage: [insert coverage %] (see CodeCov Report comment in PR)
  • [x] Backend coverage: [insert coverage %] (see CodeCov Report comment in PR)

Deliverable 3: Properly Styled Code

• [x] Are backend code style checks passing on CircleCI?
• [x] Are frontend code style checks passing on CircleCI?
• [x] Are code maintainability principles being followed?

Deliverable 4: Accessible

• [ ] Does this PR complete the epic?
• [ ] Are links included to any other gov-approved PRs associated with epic?
• [ ] Does PR include documentation for Raft's a11y review?
• [ ] Did automated and manual testing with iamjolly and ttran-hub using Accessibility Insights reveal any errors introduced in this PR?

Deliverable 5: Deployed

• [x] Was the code successfully deployed via automated CircleCI process to development on Cloud.gov?

Deliverable 6: Documented

• [x] Does this PR provide background for why coding decisions were made?
• [ ] If this PR introduces backend code, is that code easy to understand and sufficiently documented, both inline and overall?
• [ ] If this PR introduces frontend code, is that code easy to understand and sufficiently documented, both inline and overall?
• [ ] If this PR introduces dependencies, are their licenses documented?
• [x] Can reviewer explain and take ownership of these elements presented in this code review?

Deliverable 7: Secure

• [ ] Does the OWASP Scan pass on CircleCI?
• [ ] Do manual code review and manual testing detect any new security issues?
• [ ] If new issues detected, is investigation and/or remediation plan documented?

Deliverable 8: User Research

Research product(s) clearly articulate(s):

• [ ] the purpose of the research
• [ ] methods used to conduct the research
• [ ] who participated in the research
• [ ] what was tested and how
• [ ] impact of research on TDP
• [ ] (if applicable) final design mockups produced for TDP development

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.96%. Comparing base (b5f8bd7) to head (ede10a5).

Additional details and impacted files

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