[PM-4128] Remove nullability of Send.Data and Send.Keys

[harr1424]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-4128

📔 Objective

While MSSQL already enforces that Send.Data and Send.Key are not nullable, the Send entity has been updated to reflect this and EF migration scripts have been generated.

Note that as opposed to adding the required keyword to the now non-nullable properties, they are assigned a default initial value of empty string, this is ephemeral as the server will assign the key sent in the client request and assemble the JSON data from non-null components of the same request.

See related PR #7212

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
53.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Checkmarx One – Scan Summary & Details – 21c3b113-4ef2-4cce-95f2-5e1402088a44

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.75%. Comparing base (5aae028) to head (c18ca53).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7266      +/-   ##
==========================================
+ Coverage   57.62%   61.75%   +4.13%     
==========================================
  Files        2033     2033              
  Lines       89619    89619              
  Branches     7978     7978              
==========================================
+ Hits        51642    55346    +3704     
+ Misses      36117    32331    -3786     
- Partials     1860     1942      +82     

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