Easy way to Repeat Asserts for Each Test

Need a way to define an assertion that is true for every test in the testsuite

we will need to be clear if this is every teststep or every test... perhaps configurable.

User should be able to define a yaml assertion that is tested for each test and not need to repeat that for every test configuration. This is part of the spirit of the composability KEP.

No implementation files, tests, or entry points are named. First clarify whether assertions apply to each test or each test step, and whether that scope must be configurable; done should mean a YAML assertion can be defined once and is evaluated across the intended tests without repetition.

Written by the indexing model from the issue text.