Remove deprecated `dpctl.tensor` submodule #6026

Job	Run time
build_windows (3.10)	11m 44s
build_windows (3.14)	10m 58s
build_linux (3.12)	6m 49s
build_linux (3.11)	5m 12s
build_windows (3.11)	12m 34s
build_linux (3.13)	6m 31s
build_windows (3.13)	11m 4s
build_linux (3.10)	5m 4s
build_windows (3.12)	11m 30s
build_linux (3.14)	6m 35s
test_examples_linux (3.11, false, ubuntu-22.04)	12m 52s
test_linux (3.14, false, ubuntu-22.04)	3m 49s
test_linux (3.12, false, ubuntu-22.04)	3m 41s
test_linux (3.11, false, ubuntu-22.04)	3m 55s
test_linux (3.13, false, ubuntu-22.04)	4m 12s
test_linux (3.10, false, ubuntu-22.04)	4m 0s
upload_linux	0s
test_windows (3.11, false, windows-latest)	4m 5s
test_windows (3.14, false, windows-latest)	4m 42s
test_windows (3.13, false, windows-latest)	4m 1s
test_windows (3.12, false, windows-latest)	4m 13s
test_windows (3.10, false, windows-latest)	4m 55s
Clean up anaconda packages	0s
upload_windows	0s
	2h 22m 26s

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