Remove the STRICTENC flag from hundreds of script_tests cases that have nothing to do with signature or pubkey encoding. It’s a readability improvement and it makes it easier to find the actual test cases for STRICTENC behavior (those are untouched). Also, STRICTENC is a policy flag, we should default to consensus flags in script_tests.
The diff is large but mechanical as I’m only removing STRICTENC from flags. That said, if reviewers feel this cleanup is not worthwhile, I am fine dropping it.
script_tests pass on my end.