Drop events, breadcrumbs after faulty callbacks

[sentrivana]

If before_breadcrumb, an event processor, or an error processor raises an exception, the associated breadcrumb or event should be discarded as per spec.

Change goes into new major since it's breaking.

[github-actions]

Codecov Results 📊

✅ 62923 passed | ❌ 1 failed | ⏭️ 2890 skipped | Total: 65814 | Pass Rate: 95.61% | Execution Time: 170m 54s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -71240
Passed Tests	📉 -66979
Failed Tests	📈 +1
Skipped Tests	📉 -4262

➕ New Tests (1)

View new tests

• test_input_attributes_nonstreaming_chat[True-messages0-expected_system_instructions0-expected_input_messages0]
  • File: tests.integrations.mistral.test_mistral
  • Status: ❌ Failing

❌ Failed Tests

test_input_attributes_nonstreaming_chat[True-messages0-expected_system_instructions0-expected_input_messages0]

File: tests.integrations.mistral.test_mistral
Suite: py3.10-mistral-v2.0.5
Error: KeyError: 140508783394816

Stack Trace

tests/integrations/mistral/test_mistral.py:380: in test_input_attributes_nonstreaming_chat
    sentry_init(
tests/conftest.py:349: in inner
    client = sentry_sdk.Client(*a, **kw)
sentry_sdk/client.py:278: in __init__
    self._init_impl()
sentry_sdk/client.py:428: in _init_impl
    self.integrations = setup_integrations(
sentry_sdk/integrations/__init__.py:216: in setup_integrations
    for integration_cls in iter_default_integrations(
sentry_sdk/integrations/__init__.py:44: in iter_default_integrations
    yield getattr(import_module(module), cls)
/usr/lib/python3.10/importlib/__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
<frozen importlib._bootstrap>:1050: in _gcd_import
    ???
<frozen importlib._bootstrap>:1024: in _find_and_load
    ???
<frozen importlib._bootstrap>:171: in __enter__
    ???
<frozen importlib._bootstrap>:123: in acquire
    ???
E   KeyError: 140508783394816

✅ Patch coverage is 100.00%. Project has 2075 uncovered lines.
❌ Project coverage is 90.12%. Comparing base (58ea973) to head (21121d1).

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
- Coverage    90.20%    90.12%    -0.08%
==========================================
  Files          194       178       -16
  Lines        26030     21009     -5021
  Branches      9678      7584     -2094
==========================================
+ Hits         23480     18934     -4546
- Misses        2550      2075      -475
- Partials      1454      1197      -257

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