* contracts: remove op-nft

Remove the `op-nft` package from the contracts package. None of these
contracts are maintained and can be moved to another repo if necessary.
The purpose of this commit is to reduce compilation time. Less files
to compile means less compilation time.

* fix: semver lock step - ran pre-pr.

* fix: use added/modified filter for heavy fuzz

Updates the heavy fuzz filter for CI to only check for added or
modified contracts, now excluding deleted or moved contracts.

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Co-authored-by: Blaine Malone <blainemalone01@gmail.com>
Co-authored-by: Kelvin Fichter <kelvinfichter@gmail.com>