[DNM] test(symbolicator): Test compression + range requests for DIFs

[lcian]

This makes Objectstore debug-file uploads zstd-compressed and adds an integration test with a post-compression payload larger than 384 MiB. The upload deliberately uses session.put rather than multipart, and Symbolicator reads it directly from Objectstore.
The test asserts that the stored Objectstore object is zstd-compressed and still exceeds the multi-range threshold post-compression.

The test reproduces the failure: Symbolicator issues its initial 128 MiB range request plus three additional ranges, then reports Unknown frame descriptor (this can only be seen in the symbolicator container logs, sadly).
The expected successful symbolication assertion consequently fails with candidate.download.status == "notfound".

Ref FS-390

[linear-code]

FS-390

[github-actions]

Backend Test Failures

Failures on 0ff0c6f in this run:

tests/symbolicator/test_minidump_full.py::SymbolicatorLargeDebugFileIntegrationTest::test_symbolicates_large_compressed_debug_file — log

[gw0] linux -- Python 3.13.1 /home/runner/work/sentry/sentry/.venv/bin/python3
tests/symbolicator/test_minidump_full.py:292: in test_symbolicates_large_compressed_debug_file
    assert candidate["download"]["status"] == "ok"
E   AssertionError: assert 'error' == 'ok'
E     
E     �[0m�[91m- ok�[39;49;00m�[90m�[39;49;00m
E     �[92m+ error�[39;49;00m�[90m�[39;49;00m