feat(preprod): Add objectstore auth tokens for frontend image requests

[lcian]

#112469 modified frontend components that render images for snapshots to fetch directly from Objectstore.
As Objectstore will soon enforce auth, we need a way for those requests coming from the browser to carry auth information.

This adds an optional objectstore_token field to responses returned by OrganizationPreprodSnapshotEndpoint and ProjectPreprodBuildDetailsEndpoint.
The token is a short-lived token with read-only permissions, scoped down to the appropriate usecase/org/proj.
That token is passed to the frontend and threaded down to components such as AppIcon and DiffImageDisplay, which include it in image URL via the X-Os-Auth query parameter.

[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.

[github-actions]

Backend Test Failures

Failures on 9ee468a in this run:

tests/sentry/preprod/api/endpoints/test_builds.py::BuildsEndpointTest::test_one_build — log

[gw1] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/sentry/preprod/api/endpoints/test_builds.py:73: in test_one_build
    assert response.json() == [
E   AssertionError: assert [{'app_info':...e, ...}, ...}] == [{'app_info':...e, ...}, ...}]
E     
E     At index 0 diff: {'id': '79', 'state': 3, 'app_info': {'app_id': 'com.example.app', 'name': None, 'version': None, 'build_number': None, 'date_added': '2026-04-15T09:28:13.153789+00:00', 'date_built': None, 'artifact_type': 2, 'platform': 'android', 'build_configuration': None, 'app_icon_id': None, 'apple_app_info': None, 'android_app_info': {'has_proguard_mapping': True}}, 'vcs_info': {'head_sha': None, 'base_sha': None, 'provider': None, 'head_repo_name': None, 'base_repo_name': None, 'head_ref': None, 'base_ref': None, 'pr_number': None}, 'project_id': 4557971366150176, 'project_slug': 'bar', 'distribution_info': {'is_installable': False, 'download_count': 0, 'release_notes': None, 'error_code': None, 'error_message': None}, 'size_info': None, 'posted_status_checks': None, 'base_artifact_id': None, 'base_build_info': None, 'objectstore_token': None} != {'id': <ANY>, 'state': 3, 'app_info': {'app_id': 'com.example.app', 'name': None, 'version': None, 'build_number': None, 'date_added': <ANY>, 'date_built': None, 'artifact_type': 2, 'platform': 'android', 'build_configuration': None, 'app_icon_id': None, 'apple_app_info': None, 'android_app_info': {'has_proguard_mapping': True}}, 'base_artifact_id': None, 'base_build_info': None, 'distribution_info': {'download_count': 0, 'is_installable': False, 'release_notes': None, 'error_code': None, 'error_message': None}, 'vcs_info': {'head_sha': None, 'base_sha': None, 'provider': None, 'head_repo_name': None, 'base_repo_name': None, 'head_ref': None, 'base_ref': None, 'pr_number': None}, 'project_id': <ANY>, 'posted_status_checks': None, 'project_slug': 'bar', 'size_info': None}
E     
E     Full diff:
E       [
E           {
E               'app_info': {
E                   'android_app_info': {
E                       'has_proguard_mapping': True,
E                   },
E                   'app_icon_id': None,
E                   'app_id': 'com.example.app',
E                   'apple_app_info': None,
E                   'artifact_type': 2,
E                   'build_configuration': None,
E                   'build_number': None,
E     -             'date_added': <ANY>,
E     +             'date_added': '2026-04-15T09:28:13.153789+00:00',
E                   'date_built': None,
E                   'name': None,
E                   'platform': 'android',
E                   'version': None,
E               },
E               'base_artifact_id': None,
E               'base_build_info': None,
E               'distribution_info': {
E                   'download_count': 0,
E                   'error_code': None,
E                   'error_message': None,
E                   'is_installable': False,
E                   'release_notes': None,
E               },
E     -         'id': <ANY>,
E     ?               ^^^^^
E     +         'id': '79',
E     ?               ^^^^
E     +         'objectstore_token': None,
E               'posted_status_checks': None,
E     -         'project_id': <ANY>,
E     +         'project_id': 4557971366150176,
E               'project_slug': 'bar',
E               'size_info': None,
E               'state': 3,
E               'vcs_info': {
E                   'base_ref': None,
E                   'base_repo_name': None,
... (9 more lines)

[sentry]

Sentry Snapshot Testing

Name	Added	Removed	Modified	Renamed	Unchanged	Status
sentry-frontend sentry-frontend	0	0	0	0	204	✅ Unchanged