Delete ubuntu2004_exatrkx_training directory #464

Job	Run time
build (centos7-lcg100-gcc10)	19s
build (centos7-lcg101-gcc11)	9s
build (centos8-lcg100-gcc10)	10s
build (centos8-lcg101-gcc11)	12s
build (format10)	13s
build (format14)	15s
build (ubuntu1804_cuda)	2h 1m 44s
build (ubuntu1804_cuda_oneapi)	32s
build (ubuntu1804_rocm)	11s
build (ubuntu1804_rocm_oneapi)	18s
build (ubuntu2004)	12s
build (ubuntu2004_cuda)	17s
build (ubuntu2004_cuda_oneapi)	28s
build (ubuntu2004_rocm)	24s
build (ubuntu2004_rocm_oneapi)	20s
build (ubuntu2004_oneapi)	23s
build (ubuntu2004_exatrkx)	2m 17s
build (ubuntu2004_exatrkx_training)	14s
build (ubuntu2204)	23s
build (ubuntu2204_clang)	15s
build (ubuntu2204_cpp20)	10s
build (centos7-base)	19s
build (centos8-base)	13s
build (alma9-base)	21s
	2h 10m 19s

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