Add `multi_thread_greedy_pauli_optimisation` #6177

Job	Run time
Check tket library version	14s
Check C++ code formatting	27s
Build and test (tket) (ubuntu-24.04)	1m 41s
Build and test (tket) (windows-2022)	6m 18s
Build and test (tket) (macos-13)	2m 23s
Build and test (tket) (macos-15)	1m 18s
Check documentation build	53s
Build and test pytket (macos) (macos-13)	7m 53s
Build and test pytket (macos) (macos-15)	6m 21s
Build and test pytket (ubuntu)	10m 15s
Build and test pytket (windows)	14m 53s
Check pytket line and branch coverage	7s
Publish pytket coverage	0s
All build and test jobs successful (or skipped)	2s
	52m 45s

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