Technical debt clean-up in test suite

[ndgrigorian]

This PR proposes reducing the scope of the dpctl test suite by redacting tests which are redundant

For example, the dpctl test suite for element-wise functions repeatedly tests for things like usm_type of the output array. But the output array usm_type is determined in the function which dispatches to the element-wise kernel, and therefore, only needs to be tested once

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/2144/index.html

[coveralls]

coverage: 85.24% (-0.02%) from 85.262%
when pulling d97f840 on reduce-bloat-in-dpctl-test-suite
into 878cc19 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_143 ran successfully.
Passed: 1115
Failed: 6
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_144 ran successfully.
Passed: 1115
Failed: 6
Skipped: 119

[antonwolfy]

It might be helpful in the future, when we will need to debug some test.
Would it be better to comment instead?

[ndgrigorian]

I figured we'd just write it back in later if it becomes necessary again, we could just comment though

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_155 ran successfully.
Passed: 1115
Failed: 6
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_155 ran successfully.
Passed: 1114
Failed: 7
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_160 ran successfully.
Passed: 1115
Failed: 6
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_164 ran successfully.
Passed: 1115
Failed: 6
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_191 ran successfully.
Passed: 1113
Failed: 8
Skipped: 119