[ACLs] Add custom text and link to sign up form

[gino-m]

For now we can add android:autoLink="web" to the dialog permission_denied_dialog.xml and customize the contact_survey_organizer_to_obtain_access string in the of-ground fork. In the future we should read the url from Firestore config/properties/signUpUrl @rfontanarosa FYI

See also google/ground-platform#1679

[rawbzz]

@gino-m or @jcqli is there a screenshot of what screen this would need to live? ty!

[gino-m]

@rawbzz There's currently a dialog which looks something like this (sorry for bad cropping):

Needs work!

[rawbzz]

Something like this ? with a signup text link

[gino-m]

@rawbzz Much better! We should replace "Contact your system admin.." with the text explaining they don't have access and should sign up at the specified link. @amegantz for copy!

[amegantz]

To continue, contact your system administrator to request access.
To continue, sign up to request access.

If you sign out, all unsaved data will be lost.

[gino-m]

LGTM!

[gino-m]

@lecrabe @rfontanarosa FYI

[jcqli]

@shobhitagarwal1612 Do you have capacity to look work on this one?