PM-16170 removing deprecated send file endpoint

[prograhamming]

🎟️ Tracking

https://bitwarden.atlassian.net/jira/software/c/projects/BW/boards/92?selectedIssue=PM-16170

📔 Objective

Within server there’s a deprecated endpoint for uploading files to a Bitwarden Send (SendsController). This endpoint can be removed. In addition any backwards compatible logic on the client-side (send-api.service) can also be removed.

📸 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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.71%. Comparing base (cd7c4bf) to head (64997df).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5222      +/-   ##
==========================================
+ Coverage   43.70%   43.71%   +0.01%     
==========================================
  Files        1469     1469              
  Lines       67901    67885      -16     
  Branches     6156     6155       -1     
==========================================
  Hits        29673    29673              
+ Misses      36934    36918      -16     
  Partials     1294     1294              

☔ View full report in Codecov by Sentry.
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[github-actions]

Checkmarx One – Scan Summary & Details – 7d79dee4-ce8d-42ea-81d7-fbbcdaa2c748

Fixed Issues

Severity	Issue	Source File / Package
	CSRF	/src/Billing/Controllers/StripeController.cs: 164
	CSRF	/src/Billing/Controllers/RecoveryController.cs: 38
	CSRF	/src/Api/Tools/Controllers/SendsController.cs: 193
	CSRF	/src/Admin/AdminConsole/Controllers/OrganizationsController.cs: 372
	CSRF	/src/Api/Tools/Controllers/SendsController.cs: 193

[djsmith85]

@prograhamming Changes are looking good.

Adding the hold label to prevent merging, until the client-side calls to this deprecated endpoint have been removed