[PM-17562] Update documentation for event integrations

[brant-livefront]

🎟️ Tracking

PM-17562

📔 Objective

This PR migrates over and expands the documentation for the event integrations feature. Previously, some parts of this were documented in the contributing-docs repo. The goal is to modify those docs to simply refer to configuration and setup and have a local README file that documents more of the architecture and code. This PR restructures the directories a bit to unify on the EventIntegrations naming and adds the README file with more thorough documentation.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 47.73%. Comparing base (2435063) to head (5e3fcc0).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...ntegrations/AzureServiceBusEventListenerService.cs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5924      +/-   ##
==========================================
- Coverage   51.06%   47.73%   -3.33%     
==========================================
  Files        1665     1665              
  Lines       75008    75019      +11     
  Branches     6755     6757       +2     
==========================================
- Hits        38300    35811    -2489     
- Misses      35188    37748    +2560     
+ Partials     1520     1460      -60     

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[github-actions]

Checkmarx One – Scan Summary & Details – 386c8f4a-44fc-4e03-b527-06531b0e7402

Great job, no security vulnerabilities found in this Pull Request

[withinfocus]

Bunch of little things. Include diagrams next too.

Independently, I am setting up some CI and tooling to get better lint feedback on Markdown.

[sonarqubecloud]

Quality Gate passed

Issues
5 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

[withinfocus]

@JimmyVo16 for your final approval.