Remove deprecated `dpctl.tensor` submodule #6107

Job	Run time
build_windows (3.11)	11m 20s
build_linux (3.12)	5m 33s
build_linux (3.13)	5m 33s
build_linux (3.14)	5m 31s
build_windows (3.12)	12m 28s
build_windows (3.14)	11m 29s
build_linux (3.11)	5m 28s
build_windows (3.10)	11m 17s
build_linux (3.10)	7m 11s
build_windows (3.13)	11m 0s
test_examples_linux (3.11, false, ubuntu-22.04)	8m 58s
test_linux (3.12, false, ubuntu-22.04)	3m 40s
test_linux (3.13, false, ubuntu-22.04)	3m 4s
test_linux (3.11, false, ubuntu-22.04)	2m 48s
test_linux (3.10, false, ubuntu-22.04)	2m 59s
test_linux (3.14, false, ubuntu-22.04)	2m 51s
upload_linux	0s
test_windows (3.10, false, windows-latest)	4m 6s
test_windows (3.13, false, windows-latest)	5m 37s
test_windows (3.12, false, windows-latest)	4m 49s
test_windows (3.11, false, windows-latest)	4m 35s
test_windows (3.14, false, windows-latest)	4m 26s
upload_windows	-1s
Clean up anaconda packages	0s
	2h 14m 42s

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