This commit takes all backend changes for signup and invite feature. I
was working on these features and removed the generated mutations for
type user along the way.
@mattwr18 @ulfgebhardt@tirokk @appinteractive @ogerly
I think I just fixed a randomly failing test (so-called "flaky" test).
After an update of `neo4j-graphql-js` I wondered why the
`TagsAndCategories.feature` test failed consistently. It turns out the
table that you can see in the test is ordered by the "Users" column:
| | Name | Users | Posts |
| 1 | Democracy | 2 | 3 |
| 2 | Ecology | 1 | 1 |
| 3 | Nature | 1 | 2 |
So there is a tie between row 2 and row 3. It seems that on version
2.4.0 the backend would return those rows in arbitrary order and now it
returns them in a deterministic order, thus failing the test every time.
Therefore I changed the test setup and I believe this should also make
the build more robust now.
