Organizers can view and (sometimes) edit volunteer information on mission edit view

[utunga]

Part of the mission edit user story - #431

There's a special component for assigning volunteers built already - used in Mission Control in planning view. We want to keep the business logic the same as that but put it into the mission edit view. Hopefully, this can be (or already is) componentized so it can be reused here.

The organizer needs to be able to:

• see how is assigned to a mission
• see whether they are tentative or have accepted
• unassign a volunteer (up until the mission is started)
• suggest a new one (up until the mission is started)

The fields involved are:

"tentativeVolunteerUid": "",
"tentativeVolunteerDisplayName": "",
"tentativeVolunteerPhoneNumber": "",
"volunteerUid": "",
"volunteerDisplayName": "",
"volunteerPhoneNumber": "",

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Once a mission is started it should be read-only. That is if MissionState is X, then:
unassigned - editable
tentative - editable,
assigned - editable
started - read only
delivered - read only
succeeded - read only
failed - read only

Per the component, if the volunteer field is changed it should clear volunteerUid field and set tentativeVolunteerUid - thus requiring volunteer to accept it before it moves from tentative to 'accepted'

It should always be possible (whether read-only or editable) for the organizer to see whether the volunteer has 'accepted' or if the mission assignment is still 'tentative'.

[laredotornado]

Hi, Please assign this to me.