test: two phase login e2e test.

[merlin-northern]

Ticket: MEN-7099

[mender-test-bot]

@merlin-northern, Let me know if you want to start the integration pipeline by mentioning me and the command "start pipeline".

---

my commands and options

You can trigger a pipeline on multiple prs with:

• mentioning me and start pipeline --pr mender/127 --pr mender-connect/255

You can start a fast pipeline, disabling full integration tests with:

• mentioning me and start pipeline --fast

You can trigger GitHub->GitLab branch sync with:

• mentioning me and sync

You can cherry pick to a given branch or branches with:

• mentioning me and:

 cherry-pick to:
 * 1.0.x
 * 2.0.x

[merlin-northern]

no, look at that #4378 (comment) only now I noticed that the test is there already. great.

[merlin-northern]

@mzedel sorry for the noise, do not review this is a duplicate.