feat(integrations): add support for Amplitude base url

[matthewelwell]

Changes

Adds support for base_url attribute in the AmplitudeConfiguration model.

Fixes #2522

NOTE: we will also need to update the integration_data flag to expose this in the UI.

How did you test this code?

Added unit test. I've also tested this manually to verify that with the new default url (api2.amplitude.com) events are still ingested correctly.

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[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (d7c459e) 95.43% compared to head (4495768) 95.44%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2534   +/-   ##
=======================================
  Coverage   95.43%   95.44%           
=======================================
  Files         972      974    +2     
  Lines       27191    27207   +16     
=======================================
+ Hits        25951    25967   +16     
  Misses       1240     1240           

Files Changed	Coverage Δ
api/integrations/amplitude/amplitude.py	87.50% <100.00%> (-0.50%)	⬇️
api/integrations/amplitude/constants.py	100.00% <100.00%> (ø)
.../amplitude/migrations/0006_add_default_base_url.py	100.00% <100.00%> (ø)
api/integrations/amplitude/models.py	100.00% <100.00%> (ø)
api/integrations/amplitude/serializers.py	100.00% <100.00%> (ø)
...unit/integrations/amplitude/test_unit_amplitude.py	100.00% <100.00%> (ø)

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[khvn26]

Leaving this comment as a reminder to update Edge API too.

[matthewelwell]

Leaving this comment as a reminder to update Edge API too.

Yep, good point @khvn26. Edge PR is here: #2534 (review).