fix: move MintableERC721 interface

[smartcontracts]

Description
Moves the interface for the OptimismMintableERC721 into the SupportedInterfaces file where the rest of the interfaces are.

[changeset-bot]

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Latest commit: 6fbd06e

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[tynes]

Having this not need to regenerate more files is nice

[mergify]

This PR has been added to the merge queue, and will be merged soon.

[mergify]

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[mergify]

Hey @smartcontracts, this pull request failed to merge and has been dequeued from the merge train. If you believe your PR failed in the merge train because of a flaky test, requeue it by commenting with @mergifyio requeue.
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[smartcontracts]

@Mergifyio requeue

[mergify]

requeue

✅ The queue state of this pull request has been cleaned. It can be re-embarked automatically

[mergify]

This PR has been added to the merge queue, and will be merged soon.

[mergify]

This PR is next in line to be merged, and will be merged as soon as checks pass.