feat(member merge): merge account endpoint POST

[mifu67]

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POST request for the user merge account endpoint. The user passes in lists of ids that they want to merge and delete, and these are deleted/merged into the primary user account and deleted.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.18310% with 4 lines in your changes missing coverage. Please review.

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ntry/auth_v2/endpoints/auth_merge_user_accounts.py	93.22%	4 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #93395       +/-   ##
===========================================
+ Coverage   76.32%   88.10%   +11.77%     
===========================================
  Files       10589    10414      -175     
  Lines      609979   604018     -5961     
  Branches    23989    22835     -1154     
===========================================
+ Hits       465593   532179    +66586     
+ Misses     142454    71393    -71061     
+ Partials     1932      446     -1486     

[github-actions[bot]]

🚨 Warning: This pull request contains Frontend and Backend changes!

It's discouraged to make changes to Sentry's Frontend and Backend in a single pull request. The Frontend and Backend are not atomically deployed. If the changes are interdependent of each other, they must be separated into two pull requests and be made forward or backwards compatible, such that the Backend or Frontend can be safely deployed independently.

Have questions? Please ask in the #discuss-dev-infra channel.

[mifu67]

Bug: User Account Merge Fails Due to Unordered Token Retrieval

Bug: Unprotected Auth Endpoint Causes Account Merge Vulnerability

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First one is incorrect because there is unique constraint on user. @leedongwei let me know if I need the feature flag on this endpoint?