feat(organizations): member role selector TASK-986

[magicznyleszek]

📣 Summary

In Members Table (from Account → Team/Organization → Members) add UI for changing member's role.

📖 Description

Only owner and admins can modify the role.

👀 Preview steps

1. ℹ️ have multiple different users
2. for one of the users (e.g. "joe"), use http://kf.kobo.local/admin/organizations/organization/ to add multiple users into joe's organization
3. For one of the users (e.g. "sue") set the role to "admin"
4. enable "Multi-members override" for joe's organization
5. enable feature flag mmosEnabled
6. navigate to #/account/organization/members (as "joe")
7. 🟢 notice that in the table there is no way to change "joe" (owner) role
8. 🟢 notice that in the table you can change any other user role

As continuation for above steps:

1. log in as "sue"
2. navigate to #/account/organization/members
3. 🟢 notice (again) that in the table there is no way to change "joe" (owner) role (even though you're an "admin")
4. 🟢 notice that for "sue" you can change the role (to stop being an admin)

💭 Notes

Build atop #5309

[jamesrkiger]

Left one minor comment. This is good to merge after reading and/or addressing it.

[jamesrkiger]

lgtm.

One note: Given the way we are squashing merges now, it would probably be best to merge this into main (after merging the work for task 987) rather than into the 987 branch.