Remove unused files. (#1107) #4594

Job	Run time
Check tket library version	17s
Check documentation build	1m 20s
Check C++ code formatting	55s
Build and test (tket) (ubuntu-22.04)	2m 39s
Build and test (tket) (windows-2022)	28m 33s
Build and test (tket) (macos-12)	2m 37s
Build and test pytket (macos) (macos-12)	13m 18s
Build and test (tket) (macos-13-xlarge)	1m 33s
Build and test pytket (macos) (macos-13-xlarge)	6m 3s
Build and test pytket (ubuntu)	8m 0s
Build and test pytket (windows)	14m 39s
Build and test (tket)	0s
Check pytket line and branch coverage	0s
Publish pytket coverage	28s
	1h 20m 22s

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