OCM: creating an invite token should return 201

[butonic]

we seem to use the wrong response code when creating an ocm invite token. I wanted to change it, but the tests say we should return a 200 Status code:

• [FAILED] [8.186 seconds]
ocm invitation workflow clients use the http endpoints exposed by sciencemesh generate the token from http apis [It] succeeds
/drone/src/tests/integration/grpc/ocm_invitation_test.go:519

  [FAILED] Expected
      <int>: 201
  to equal
      <int>: 200
  In [It] at: /drone/src/tests/integration/grpc/ocm_invitation_test.go:525 @ 09/05/24 09:17:45.026
------------------------------

While I strongly disagree. I'll revert that change and rerun the CI of #4836. For now.

[glpatcern]

Going through issues, I see this one - and I agree with your disagreement @butonic :) This being off OCM, I think you can change the behavior and the test right away, and I should do the same on Reva master.

By the way, I'll see you next Wednesday, right?