7bb83f6718 test: create assert_not_equal util and add to where imports are needed (kevkevin)
Pull request description:
In the functional tests there are lots of cases where we assert != which we now swap with assert_not_equal to be more readable
This is motivated/uses logic from this PR which was closed https://github.com/bitcoin/bitcoin/pull/28528
This partially helps https://github.com/bitcoin/bitcoin/issues/23119
I've broken it up to just `assert_not_equal` to keep the PR smaller as suggested in https://github.com/bitcoin/bitcoin/pull/28528#issuecomment-1959945805
I can create follow up PR's if this is wanted
ACKs for top commit:
hodlinator:
re-ACK 7bb83f6718
ryanofsky:
Code review ACK 7bb83f6718. Only change since last review is fixing error message formatting and passing it as a keyword argument
janb84:
Re-ACK [7bb83f6](7bb83f6718)
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