[MNT] Add/rework transformation tests and remove from exclude list

[MatthewMiddlehurst]

Reworks the tests for transformers a bit, adds some basic checks for tags and output. Removes transformers and some others from the exclude list.

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I would have added the following labels to this PR based on the changes made: [ $\color{#2C2F20}{\textsf{testing}}$, $\color{#41A8F6}{\textsf{transformations}}$ ], however some package labels are already present.

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[baraline]

LGTM but this comment, tested on aeon 0.11.1 and not on main though, did we make a change to RIST in the meantime ?