Fix npm publish workflow

[gwdawson]

the publish-npm workflow is failing with sh: 1: husky: not found. this is because husky is a dev dependency but the workflow only installs production dependencies.

this workaround stems from the following: https://github.com/typicode/husky/issues/914#issuecomment-1376981862

how this works:

• if husky exists in node_modules then we can run the scrip and it wont fail.
• if it doesn't exist (package not installed) we do nothing.