feat(langchain): Support BaseCallbackManager

[szokeasaurusrex]

While implementing #4479, I noticed that our Langchain integration lacks support for the local_callbacks having type BaseCallbackManager, which according to the type hint is possible.

This change adds support for this case.

---

Thank you for contributing to sentry-python! Please add tests to validate your changes, and lint your code using tox -e linters.

Running the test suite on your PR might require maintainer approval.

[codecov]

Codecov Report

Attention: Patch coverage is 70.58824% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.66%. Comparing base (901b579) to head (2468de2).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
sentry_sdk/integrations/langchain.py	70.58%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@                             Coverage Diff                             @@
##           szokeasaurusrex/refactor-langchain-args    #4486      +/-   ##
===========================================================================
+ Coverage                                    80.63%   80.66%   +0.03%     
===========================================================================
  Files                                          142      142              
  Lines                                        16037    16031       -6     
  Branches                                      2741     2743       +2     
===========================================================================
  Hits                                         12932    12932              
+ Misses                                        2239     2237       -2     
+ Partials                                       866      862       -4     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/langchain.py	71.48% <70.58%> (+1.05%)	⬆️

... and 4 files with indirect coverage changes