Added missing usm_type to tril() and triu() functions.

[npolina4]

Allocation for the result array did not honor usm_type of the argument for dpctl.tensor.tril, dpctl.tensor.triu functions.

This PR fixes that and adds tests.

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• Have you added a test, reproducer or referred to an issue with a reproducer?
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• Have you made sure that new changes do not introduce compiler warnings?
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[coveralls]

Coverage: ?%. Remained the same when pulling e0b79ff on fix_tril_triu_usm_type into 7c15231 on master.

[coveralls]

Coverage: 82.208%. Remained the same when pulling ec8509f on fix_tril_triu_usm_type into 7c15231 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.14.1dev1=py310h76be34b_79 ran successfully.
Passed: 33
Failed: 801
Skipped: 280

[github-actions]

Array API standard conformance tests for dpctl=0.14.1dev1=py310h76be34b_80 ran successfully.
Passed: 33
Failed: 801
Skipped: 280

[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1062/index.html

[oleksandr-pavlyk]

PR descriptions, and tests are useful.

PR description is useful for release note writing, and tests are useful for regression testing.

[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[github-actions]

Array API standard conformance tests for dpctl=0.14.1dev1=py310h76be34b_80 ran successfully.
Passed: 33
Failed: 801
Skipped: 280