Fix search reductions giving incorrect results for F-contiguous inputs

[ndgrigorian]

This pull request restricts calls of contiguous variants for search reductions, now excluding cases where F-contiguous data is reduced to a single value.

These cases would return the index as if counting down columns rather than counting along the rows.

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[coveralls]

coverage: 85.748%. remained the same when pulling 064a44c on fix-search-reductions-contig-cases into 9131925 on master.

[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1462/index.html

[github-actions]

Array API standard conformance tests for dpctl=0.15.1dev0=py310ha25a700_75 ran successfully.
Passed: 935
Failed: 65
Skipped: 119

[vtavana]

Thank you, @ndgrigorian!
It works fine now.

x=[[1, 2, 3],[6, 5, 4]]
numpy.argmax(numpy.array(x, order='F'))
3

dpt.argmax(dpt.asarray(x, order='F'))
usm_ndarray(3)