feat(replays): Add data export

[cmanallen]

Added data-export for Session Replay to comply with EU data-portability regulations.

[github-actions]

🚨 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.

[seer-by-sentry]

Potential bug: The save_to_storage function incorrectly asserts the storage backend is GoogleCloudStorage, which will cause a crash if the default filesystem or S3 storage is used.

• Description: The save_to_storage function, used for replay data exports, includes an assertion that the storage backend must be an instance of GoogleCloudStorage. However, the default storage backend for Sentry is filesystem, and it can also be configured to use other backends like S3. When the replay data export feature is triggered in an environment not using Google Cloud Storage, this isinstance check will fail, raising an AssertionError and crashing the background task handling the export. This will break the data export functionality, which is a compliance-related feature, in all non-GCS deployments.

• Suggested fix: Remove the hard assertion assert isinstance(storage, GoogleCloudStorage). The function should either be made storage-agnostic or include logic to handle different storage backends. Alternatively, add configuration validation to ensure this feature is only used when Google Cloud Storage is the configured filestore backend.
  _{severity: 0.85, confidence: 0.98}

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[cmanallen]

We want it to crash.

[codecov]

Codecov Report

❌ Patch coverage is 92.35294% with 13 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/sentry/replays/data_export.py	91.39%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #100778    +/-   ##
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  Coverage   81.13%    81.13%            
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  Files        8607      8609     +2     
  Lines      381775    381945   +170     
  Branches    24015     24015            
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+ Hits       309743    309897   +154     
- Misses      71705     71721    +16     
  Partials      327       327            

[sentry-io]

Issues attributed to commits in this pull request

This pull request was merged and Sentry observed the following issues:

• ‼️ AssertionError: assert 2 == 3 in test

• ‼️ AssertionError: assert not True in test

• ‼️ AssertionError: assert 2 == 3 in test