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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