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4a2833c1 - [Modular] implement requirements validation for custom blocks (#12196)

[Modular] implement requirements validation for custom blocks (#12196) * feat: implement requirements validation for custom blocks. * up * unify. * up * add tests * Apply suggestions from code review Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com> * reviewer feedback. * [docs] validation for custom blocks (#13156) validation * move to tmp_path fixture. * propagate to conditional and loopsequential blocks. * up * remove collected tests --------- Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com> Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>