feat(mistral): Record token usage

[alexander-alderman-webb]

Description

Record gen_ai.usage.input_tokens, gen_ai.usage.output_tokens and gen_ai.usage.total_tokens attributes.

Issues

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 128354 passed | ⏭️ 7148 skipped | Total: 135502 | Pass Rate: 94.72% | Execution Time: 443m 57s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +156
Passed Tests	📈 +139
Failed Tests	—
Skipped Tests	📈 +17

All tests are passing successfully.

✅ Patch coverage is 90.48%. Project has 2536 uncovered lines.
✅ Project coverage is 90.19%. Comparing base (988fd0e) to head (3d1db0b).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/mistral.py	90.48%	⚠️ 2 Missing and 8 partials

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
+ Coverage    90.19%    90.19%        —%
==========================================
  Files          194       194         —
  Lines        25833     25852       +19
  Branches      9544      9560       +16
==========================================
+ Hits         23299     23316       +17
- Misses        2534      2536        +2
- Partials      1435      1442        +7

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