Remove explicit snakeyaml dependency

[MarkEWaite]

Remove explicit snakeyaml dependency

Rely on the transitive dependency from the Jackson dataformat library.

Commit 6239603 added the dependency in order to assure that we were including the most recent release of the snakeyaml jar file. The Jackson dataformat library version that we are using already depends on the most recent snakeyaml release, so we no longer need this explicit dependency.

Reverts 6239603

Testing done

Confirmed that automated tests pass

Confirmed that the snakeyaml included in the plugin installation manager jar file after this change is the same as the snakeyaml included in the most recent release.

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