Use deterministically generated script tests

Now that signing is deterministic, we can require exact correspondence between the
automatically generated tests and the ones read from JSON. Do this, and update
the tests to those deterministic versions. Note that some flag changes weren't
correctly applied before.
Move CHECKMULTISIG order tests out of automatically generated block
Merge pull request #5401

362001c Move CHECKMULTISIG order tests out of automatically generated block (Pieter Wuille)
f67a9ce Use deterministically generated script tests (Pieter Wuille)