Remove deprecated `dpctl.tensor` submodule #6120

Job	Run time
build_windows (3.13)	10m 58s
build_linux (3.11)	5m 54s
build_linux (3.10)	5m 11s
build_linux (3.13)	5m 42s
build_windows (3.14)	10m 17s
build_linux (3.14)	5m 58s
build_linux (3.12)	5m 23s
build_windows (3.12)	15m 8s
build_windows (3.10)	9m 46s
build_windows (3.11)	11m 18s
test_examples_linux (3.11, false, ubuntu-22.04)	9m 25s
test_linux (3.14, false, ubuntu-22.04)	2m 58s
test_linux (3.11, false, ubuntu-22.04)	3m 3s
test_linux (3.10, false, ubuntu-22.04)	3m 4s
test_linux (3.12, false, ubuntu-22.04)	3m 3s
test_linux (3.13, false, ubuntu-22.04)	3m 13s
upload_linux	0s
test_windows (3.14, false, windows-latest)	4m 58s
test_windows (3.13, false, windows-latest)	4m 43s
test_windows (3.12, false, windows-latest)	3m 52s
test_windows (3.11, false, windows-latest)	4m 54s
test_windows (3.10, false, windows-latest)	4m 35s
upload_windows	0s
Clean up anaconda packages	-1s
	2h 13m 22s

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