Guard Add Users buttons on team details page

[bcmdarroch]

Describe the bug

Right now there is no mechanism for hiding the Add Users button on the team-details page when the logged-in user has no permissions.

This will require refactoring the user-table a bit. Right now we're passing overridePermissions input to the table on team-details. This was because at the time we did not have parameterized introspection. Now we do! So let's fix this.

To Reproduce

1. start Automate
2. create a policy

echo '{
   "name": "testing",
   "id": "test1",
   "members": [
     "user:local:test"
   ],
   "statements": [
     {
       "effect": "ALLOW",
       "actions": ["iam:*:list", "iam:*:get"],
       "projects": [
         "*"
       ]
     }
   ],
   "projects": []
 }' >> pol.json

export TOK=`chef-automate iam token create ADM --admin`
curl -kH "api-token: $TOK" -X POST -d @pol.json https://localhost/apis/iam/v2/policies?pretty

3. log in to the UI as admin
4. create user test
5. log in as user test
6. navigate to https://a2-dev.test/settings/teams/admins
7. you should be able to click Add Users, try to add some users, then get a 403 error

Expected behavior

If a logged-in user is allowed to see a team and its users but is not allowed to manage team membership, they will not see the Add Users button on the team details page.

Design Details

• hide the add users button if they don't have permission to add users to a team
• if they happen to navigate to the add users page of a team, display this message on the page: It looks like you don't have permission to add users to this team. Reach out to your administrator or contact Chef Support for help. with Chef Support being an open in new tab link to our support page

Visual Design of Message

this or similar, feel free to use other properties to do the same thing

margin-top: 80px;
font-size: 18px;
line-height: 28px;

TBD if we also want to make some changes to the team-add-users modal in the case that someone without permissions navigated directly to https://a2-dev.test/settings/teams/admins/add-users. That would require some UX design from @susanev.