Remove deprecated `dpctl.tensor` submodule #6025

Job	Run time
build_linux (3.11)	5m 48s
build_windows (3.11)	12m 30s
build_linux (3.12)	5m 43s
build_linux (3.14)	5m 52s
build_windows (3.10)	11m 37s
build_linux (3.10)	6m 11s
build_windows (3.12)	11m 32s
build_windows (3.13)	11m 8s
build_linux (3.13)	5m 38s
build_windows (3.14)	10m 44s
test_examples_linux (3.11, false, ubuntu-22.04)	9m 11s
test_linux (3.12, false, ubuntu-22.04)	2m 13s
test_linux (3.13, false, ubuntu-22.04)	2m 12s
test_linux (3.11, false, ubuntu-22.04)	2m 7s
test_linux (3.10, false, ubuntu-22.04)	2m 10s
test_linux (3.14, false, ubuntu-22.04)	2m 19s
upload_linux	0s
test_windows (3.10, false, windows-latest)	3m 20s
test_windows (3.14, false, windows-latest)	3m 30s
test_windows (3.11, false, windows-latest)	3m 22s
test_windows (3.13, false, windows-latest)	3m 25s
test_windows (3.12, false, windows-latest)	3m 23s
upload_windows	-1s
Clean up anaconda packages	0s
	2h 3m 54s

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