feat(clickup): Assignee Dropdown for Create Comment Action

[founderblocks-sils]

I've kept the original (weird) behaviour of setting the API user as assignee by default to not break past scenarios.

What does this PR do?

Allow people to set the assignee when posting comments on clickup.

[CLAassistant]

All committers have signed the CLA.

[nx-cloud]

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[abuaboud]

@allcontributors please add @founderblocks-sils for plugin

[allcontributors]

@abuaboud

I've put up a pull request to add @founderblocks-sils! 🎉

[abuaboud]

@founderblocks-sils Thank you a lot!