[PM-14798] Update ProviderEventService for multi-organization enterprises

[jonashendrickx]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-14798

📔 Objective

Just refactored the ProviderEventService to support the new provider type. The validation should have already been completed elsewhere for assigned specific plans with each provider type, which can simplify the code quite a bit.

Or should we keep these extra lines of validation to detect any corruption before it has caused enough trouble?

📸 Screenshots

⏰ 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

[github-actions]

Checkmarx One – Scan Summary & Details – 8c330772-b633-44af-9b5b-8e4093b18b58

No New Or Fixed Issues Found

[codecov]

Codecov Report

Attention: Patch coverage is 72.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 42.56%. Comparing base (702a81b) to head (0c5844d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...g/Services/Implementations/ProviderEventService.cs	72.00%	2 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5026      +/-   ##
==========================================
- Coverage   42.58%   42.56%   -0.03%     
==========================================
  Files        1406     1406              
  Lines       65074    65052      -22     
  Branches     5962     5962              
==========================================
- Hits        27715    27691      -24     
- Misses      36131    36133       +2     
  Partials     1228     1228              

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