ref(pydantic-ai): Use tool hooks

[alexander-alderman-webb]

Description

Use hooks.on.tool_validate_error() and hooks.on.tool_execute() to replace monkey patches.

This is breaking because tool_validate_error captures one exception per retry. The previous ToolManager patch only captured one exception per attempted tool execution, even if it was retried.

Also add some more precise types.

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 📊

✅ 69071 passed | ❌ 1 failed | ⏭️ 3315 skipped | Total: 72387 | Pass Rate: 95.42% | Execution Time: 211m 54s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -65319
Passed Tests	📉 -61513
Failed Tests	📈 +1
Skipped Tests	📉 -3807

➕ New Tests (1)

View new tests

• test_cache_spans_templatetag
  • File: tests.integrations.django.test_cache_module
  • Status: ❌ Failing

❌ Failed Tests

test_cache_spans_templatetag

File: tests.integrations.django.test_cache_module
Suite: py3.11-django-v4.2.30
Error: tests/integrations/django/test_cache_module.py:337: in test_cache_spans_templatetag assert not spans[0]["attributes"]["cache.hit"] E assert not True

Stack Trace

tests/integrations/django/test_cache_module.py:337: in test_cache_spans_templatetag
    assert not spans[0]["attributes"]["cache.hit"]
E   assert not True

✅ Patch coverage is 100.00%. Project has 2296 uncovered lines.
❌ Project coverage is 89.77%. Comparing base (4c4e94b) to head (89fa571).

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
- Coverage    90.18%    89.77%    -0.41%
==========================================
  Files          193       183       -10
  Lines        25790     22436     -3354
  Branches      9532      8136     -1396
==========================================
+ Hits         23256     20140     -3116
- Misses        2534      2296      -238
- Partials      1434      1323      -111

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