"Replace Generator" button

[dpgraham4401]

🐛 Bug Report

On a manifest, the user have the option to replace the generator if the following is true.

1. The manifest status is one of the below
   • Draft (the value of status is actually NotAssigned)
   • Pending
   • Any status beyond these and the user should not be able to modify the generator
     AND
2. The user has access to one of the other sites on the manifest (one of the transporters or the TSDF).
   • The sites the user has access to is in the redux store (RcraProfile)
     AND
3. The manifest is in a editable mode (not readonly).

When the button is clicked, it should bring up the handler search form (the same form that's brought up for a new manifest that does not already have a generator).

If someone is working on this besides me, it may help to log into the django admin page (at http://localhost:8000) and change the site type of the VATESTGEN001 from Generator to Tsdf. That way when a new manifest is created with this site it doesn't default as the generator.