Fix technical debt in trig element-wise function tests

[ndgrigorian]

This PR proposes removing a number of trig tests, and rewriting some

Some of these tests are redundant with other tests already present in the test suite, checking the outcome of generic parts of the element-wise function machinery (i.e., testing for identical output usm_type as input). Any arbitrary element-wise function could be used to check this machinery.

Also removes all tests for complex special cases, as

• NumPy may provide different results conditionally
• the array API test suite already tracks these special cases
• cmath cannot be used without creating complicated logic in the test suite

reintroducing or rewriting these tests for a smaller subset of complex special cases, and for each function individually, may be a step to take in a later PR, when further refactoring the test suite

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[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=0.21.0dev0=py310h93fe807_69 ran successfully.
Passed: 1115
Failed: 6
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_69 ran successfully.
Passed: 1115
Failed: 6
Skipped: 119

[coveralls]

coverage: 85.888% (-0.005%) from 85.893%
when pulling 636147d on refactor-trig-tests
into 8c94751 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_74 ran successfully.
Passed: 1115
Failed: 6
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_75 ran successfully.
Passed: 1115
Failed: 6
Skipped: 119

[vtavana]

Thank you, @ndgrigorian!