[chore] Add readonly matrix test. Remove invalid mutability assertions #10632
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The primary objective here was to add new test cases for the graph. However, I found that mutability assertions added in #8634 appear to be nondeterministic. Therefore, important test cases cannot be covered with them in place. This effectively removes the assertions about mutability for now.
@dmitryax, I'm curious if you have better ideas here. I am thinking that perhaps it would be better to have an entirely separate set of test cases which are focused on mutability expectations.