Remove `prune_dependency_tree` and reuse `getfixtureclosure` logic

[sadra-barikbin]

• To reuse getfixtureclosure in pruning dependency tree. In pytest, fixture closure of a test is computed twice if it's parametrized. The second computation takes place in prune_dependency_tree. They are the same except that the second one should also ignore dynamically-introduced parametrise args, besides the ones in ignore_args. The motivation behind unifying these two was that the code for computing the closure got larger in the 7th improvement of #11234 so the duplicate code between these two had become significant. Maybe the bad news is that now I figured out that I need is_pseudo concept for unifying the two, to do the additional objective of the second computation.

• To prune dependency tree only if dynamic parametrization has taken place. Currently for each parametrized test , directly or indirectly, dynamically or non-dynamically(using @pytest.mark.parametrize), computing fixture closure takes place twice. Once in FixtureManager::getfixtureclosure upon creating FuncFixtureInfo and once in prunc_dependency_tree after calling pytest_generate_tests hook. The second one is only necessary if direct dynamic parametrization has occurred for the test because this is the only parametrization that might shadow some fixtures in the fixture closure computed in the first call. Note that as differentiating between direct and indirect dynamic parametrization requires a dirty hack, the second fixture closure computation in this PR is done in the latter case as well.

[bluetech]

@sadra-barikbin Can you please rebase this on latest main?