Add Deployment selection button to open Entrypoint files

[dotNomad]

On hold waiting for the API changes in #1847

This PR will add the publish button to the open entrypoint files.

To determine if the button should be added we can call the new /api/inspect?entrypoint=path API. If any results are in the response we know its a valid entrypoint.

When the button is clicked:

• Call the new /api/deployments?entrypoint=path endpoint
• Guide the user to create a new Deployment / Configuration with that file as the entrypoint if one doesn’t exist
• Select the Deployment / Configuration in the sidebar with that entrypoint if length === 1
• Prompt the user to select from the multiple Deployments with the given entrypoint

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Part of the #1846 epic.

[dotNomad]

I see this button as an alternative to opening the sidebar and selecting a Deployment, not as a button to initiate a deployment. That will still be the job of the sidebar.