ci: Add langchain-base to uv typing group

[alexander-alderman-webb]

Description

Add package to the group and fix typing problems.
Remove test that relied on mocks and assert on gen_ai.response.model in other tests.

Issues

Closes #7017

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 📊

✅ 94838 passed | ⏭️ 6343 skipped | Total: 101181 | Pass Rate: 93.73% | Execution Time: 338m 52s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -144
Passed Tests	📉 -144
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2510 uncovered lines.
✅ Project coverage is 89.89%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/langchain.py	100.00%	⚠️ 1 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.88%    89.89%    +0.01%
==========================================
  Files          193       193         —
  Lines        24834     24826        -8
  Branches      8912      8914        +2
==========================================
+ Hits         22321     22316        -5
- Misses        2513      2510        -3
- Partials      1417      1413        -4

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Generated by Codecov Action

[cursor]

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