docs: Added separate developer guide section

[Kevinjoeharris]

The idea is to create more clear documentation for developers like one which we have in Argo CD. Starting off with Code Quality and Security Scanning and will add others files one by one in the upcoming PRs.

Screenshot from my local machine:

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional with a list of types and scopes found here, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed my commits with DCO
• My builds are green. Try syncing with master if they are not.
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• I have run all tests locally (including the flaky ones) and they pass on my workstation
• I have used LLM/AI/Agent tools for this PR but I am responsible for all code of this PR
• I understand what the code does and WHY/HOW it works in several scenarios
• I know if my code is just adding new functionality or changing old functionality for existing users
• My organization is added to USERS.md.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.00%. Comparing base (c40cb0d) to head (67f0301).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4711      +/-   ##
==========================================
+ Coverage   84.92%   85.00%   +0.08%     
==========================================
  Files         164      164              
  Lines       18966    18989      +23     
==========================================
+ Hits        16107    16142      +35     
+ Misses       2002     1996       -6     
+ Partials      857      851       -6     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[github-actions]

Published E2E Test Results

  4 files    4 suites   3h 46m 37s ⏱️
120 tests 108 ✅  7 💤 5 ❌
488 runs  452 ✅ 28 💤 8 ❌

For more details on these failures, see this check.

Results for commit 67f0301.

[github-actions]

Published Unit Test Results

2 465 tests   2 465 ✅  3m 21s ⏱️
  129 suites      0 💤
    1 files        0 ❌

Results for commit 67f0301.