[Frontend][OpenMP] Add unit tests for getLeafConstructsOrSelf, NFC (#90110)

[Frontend][OpenMP] Implement getLeafOrCompositeConstructs (#89104)

This function will break up a construct into constituent leaf and
composite constructs, e.g. if OMPD_c_d_e and OMPD_d_e are compos

[Frontend][OpenMP] Implement getLeafOrCompositeConstructs (#89104)

This function will break up a construct into constituent leaf and
composite constructs, e.g. if OMPD_c_d_e and OMPD_d_e are composite
constructs, then OMPD_a_b_c_d_e will be broken up into the list {OMPD_a,
OMPD_b, OMPD_c_d_e}.

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[Frontend][OpenMP] Add functions for checking construct type (#87258)

Implement helper functions to identify leaf, composite, and combined
constructs.