adding documentation on cloudgov s3 incident response

[ADPennington]

Summary of Changes

Adds documentation on TDP team's response to the cloud.gov S3 security incident in Oct 2023.
Pull request closes #2732

How to Test

List the steps to test the PR
These steps are generic, please adjust as necessary.

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. Open http://localhost:3000/ and sign in.
2. Proceed with functional tests as described herein.
3. Test steps should be captured in the demo GIF(s) and/or screenshots below.

Demo GIF(s) and screenshots for testing procedure

Deliverables

More details on how deliverables herein are assessed included here.

Deliverable 1: Accepted Features

Checklist of ACs:

• [insert ACs here]
• lfrohlich and/or adpennington confirmed that ACs are met.

Deliverable 2: Tested Code

• Are all areas of code introduced in this PR meaningfully tested?
  • 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)
  • Backend coverage: [insert coverage %] (see CodeCov Report comment in PR)

Deliverable 3: Properly Styled Code

• Are backend code style checks passing on CircleCI?
• Are frontend code style checks passing on CircleCI?
• 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

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

Deliverable 6: Documented

• 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?
• 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]

Codecov Report

Merging #2763 (4f0e12e) into develop (e5ccc2c) will decrease coverage by 0.02%.
Report is 2 commits behind head on develop.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2763      +/-   ##
===========================================
- Coverage    92.80%   92.78%   -0.02%     
===========================================
  Files          246      246              
  Lines         5576     5575       -1     
  Branches       480      479       -1     
===========================================
- Hits          5175     5173       -2     
- Misses         308      309       +1     
  Partials        93       93              

Flag	Coverage Δ
dev-backend	92.77% <ø> (-0.03%)	⬇️
dev-frontend	92.83% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
tdrs-backend/tdpservice/parsers/models.py	92.06% <ø> (-1.69%)	⬇️

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