Remove deprecated `dpctl.tensor` submodule #6143

Job	Run time
build_linux (3.13)	5m 37s
build_linux (3.10)	4m 57s
build_linux (3.12)	5m 32s
build_linux (3.14)	5m 39s
build_linux (3.11)	5m 18s
build_windows (3.11)	11m 29s
build_windows (3.10)	11m 25s
build_windows (3.13)	12m 20s
build_windows (3.14)	10m 55s
build_windows (3.12)	10m 1s
test_examples_linux (3.11, false, ubuntu-22.04)	9m 25s
test_linux (3.10, false, ubuntu-22.04)	2m 46s
test_linux (3.12, false, ubuntu-22.04)	3m 18s
test_linux (3.14, false, ubuntu-22.04)	3m 9s
test_linux (3.13, false, ubuntu-22.04)	3m 4s
test_linux (3.11, false, ubuntu-22.04)	2m 57s
upload_linux	-1s
test_windows (3.13, false, windows-latest)	4m 4s
test_windows (3.10, false, windows-latest)	4m 20s
test_windows (3.11, false, windows-latest)	5m 58s
test_windows (3.12, false, windows-latest)	4m 10s
test_windows (3.14, false, windows-latest)	4m 48s
upload_windows	-1s
Clean up anaconda packages	-1s
	2h 11m 9s

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