Add Head Job configuration to PathwaysJobSet #912

Job	Run time
Unittests (Python 3.14, JAX nightly)	2m 4s
Unittests (Python 3.13, JAX 0.8.3)	32s
Unittests (Python 3.14, JAX 0.9.0)	30s
Unittests (Python 3.12, JAX 0.10.1)	32s
Unittests (Python 3.14, JAX 0.8.3)	37s
Unittests (Python 3.12, JAX 0.10.0)	31s
Unittests (Python 3.13, JAX 0.9.0)	26s
Unittests (Python 3.11, JAX 0.9.1)	33s
Unittests (Python 3.13, JAX 0.9.2)	29s
Unittests (Python 3.14, JAX 0.10.0)	31s
Unittests (Python 3.13, JAX 0.9.1)	29s
Unittests (Python 3.11, JAX nightly)	50s
Unittests (Python 3.11, JAX 0.9.0)	31s
Unittests (Python 3.11, JAX 0.10.0)	28s
Unittests (Python 3.14, JAX 0.10.1)	36s
Unittests (Python 3.12, JAX 0.9.1)	29s
Unittests (Python 3.12, JAX 0.8.3)	26s
Unittests (Python 3.14, JAX 0.9.1)	37s
Unittests (Python 3.13, JAX nightly)	2m 35s
Unittests (Python 3.11, JAX 0.9.2)	28s
Unittests (Python 3.13, JAX 0.10.0)	41s
Unittests (Python 3.13, JAX 0.10.1)	31s
Unittests (Python 3.12, JAX 0.9.2)	28s
Unittests (Python 3.12, JAX 0.9.0)	28s
Unittests (Python 3.11, JAX 0.10.1)	28s
Unittests (Python 3.11, JAX 0.8.3)	29s
Unittests (Python 3.12, JAX nightly)	1m 50s
Unittests (Python 3.14, JAX 0.9.2)	31s
	19m 40s

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