[MNT] Remove legacy testing

[MatthewMiddlehurst]

Follows on from #1877 and #2037, part of AEP 05.

• Removes the old class based testing framework and scenario files
• Removes the current test_all_* files for anomaly detection, segmentation, transformers and early classification.
• Replaces them with a yield function in the new testing framework.
• Renames test_config.py to testing_config.py because test_ files generally contain test functions which the config does not.
• Moves some of the soft dependency tests into the new framework. Non-estimator tests remain.
• Adds a bunch of new classifiers to the exclusion list.

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[TonyBagnall]

LGTM

[SebastianSchmidl]

I did not go through the individual changes or checked if the checks all make sense, but the new structure is good and makes sense.