purge: remove grant ownership feature

[thelostone-mc]

Description

removes grant ownership feature in grant.
Once a grant has been created, the grant owner can

• edit grant info
• cancel grant (if logged in with the address with which the grant is created )

Refers/Fixes

closes #4839

Testing

• Created Grant
• Edited Grant Info
• Cancel Grant
• Edit Grant via Admin

Demo : https://embed.vidyard.com/share/pkJZKTs3GjcQZcP42aJHf9?

[danlipert]

Looks good @thelostone-mc - we should also remove the little down arrow in the grant owner box since that makes it look like you can change it. Also the audio was on in your video :P

[thelostone-mc]

Derp derp ! I forgot to turn out the audio :P
@danlipert removed the title dropdown

This is what it looks like now if you are logged in as the grant owner ^_^

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@ec99266). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master    #4878   +/-   ##
=========================================
  Coverage          ?   30.82%           
=========================================
  Files             ?      216           
  Lines             ?    17387           
  Branches          ?     2374           
=========================================
  Hits              ?     5359           
  Misses            ?    11811           
  Partials          ?      217

Impacted Files	Coverage Δ
app/marketing/mails.py	14.36% <ø> (ø)
app/grants/models.py	59.39% <ø> (ø)
app/grants/admin.py	42.68% <ø> (ø)
app/retail/emails.py	23.59% <ø> (ø)
app/app/urls.py	89.36% <ø> (ø)
app/grants/views.py	14.78% <0%> (ø)

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[thelostone-mc]

rebased + retested
@octavioamu / @danlipert

[owocki]

this caused a regression here @thelostone-mc #5026