* Restore AvailabilityStrategy
* Add test for http availability strategy on empty stream from original bug fix 7c17351631
* fix flake errors
* Change CheckStream to use availability strategy
* Refactor test from bug fix
* fix flake errors
* Remove extra helper file from cherry-pick
* Merge tests for default http availability strategy
* turn off HttpAvailabilityStrategy as default (for now) (#21488)
* turn off HttpAvailabilityStrategy as default (for now)
* Update imports accordingly
* Rough first implememtation of AvailabilityStrategy s
* Basic unit tests for AvailabilityStrategy and ScopedAvailabilityStrategy
* Make availability_strategy a property, separate out tests
* Remove from DeclarativeSource, remove Source parameter from methods, make default no AvailabilityStrategy
* Add skip stream if not available to read()
* Changes to CDK to get source-github working using AvailabilityStrategy, flakecheck
* reorganize cdk class, add HTTPAvailabilityStrategy test
* cleanup, docstrings
* pull out error handling into separate method
* Pass source and logger to check_connection method
* Add documentation links, handle 403 specifically
* Fix circular import
* Add AvailabilityStrategy to Stream and HTTPStream classes
* Remove AS from abstract_source, add to Stream, HTTPStream, AvailabilityStrategy unit tests passing for per-stream strategies
* Modify MockHttpStream to set no AvailabilityStrategy since source test mocking doesn't support this
* Move AvailabilityStrategy class to sources.streams
* Move HTTPAvailabilityStrategy to http module
* Use pascal case for HttpAvailabilityStrategy
* Remove docs message method :( and default to True availability on unhandled HTTPErrors
* add check_availability method to stream class
* Add optional source parameter
* Add test for connector-specific documentation, small tests refactor
* Add test that performs the read() function for stream with default availability strategy
* Add test for read function behavior when stream is unavailable
* Add 403 info in logger message
* Don't return error for other HTTPErrors
* Split up error handling into methods 'unavailable_error_codes' and 'get_reason_for_error'
* rework overrideable list of status codes to be a dict with reasons, to enforce that users provide reasons for all listed errors
* Fix incorrect typing
* Move HttpAvailability to its own module, fix flake errors
* Fix ScopedAvailabilityStrategy, docstrings and types for streams/availability_strategy.py
* Docstrings and types for core.py and http/availability_strategy.py
* Move _get_stream_slices to a StreamHelper class
* Docstrings + types for stream_helpers.py, cleanup test_availability.py
* Clean up test_source.py
* Move logic of getting the initial record from a stream to StreamHelper class
* Add changelog and bump minor version
* change 'is True' and 'is False' behavior
* use mocker.MagicMock
* Remove ScopedAvailabilityStrategy
* Don't except non-403 errors, check_stream uses availability_strategy if possible
* CDK: pass error to reasons_for_error_codes
* make get_stream_slice public
* Add tests for raising unhandled errors and retries are handled
* Add tests for CheckStream via AvailabilityStrategy
* Add documentation for stream availability of http streams
* Move availability unit tests to correct modules, report error message if possible
* Add test for reporting specific error if available
