Redteamer can now acknowledge clearance level during onboarding

[Rieven]

Changes

• Adding screen in onboarding to acknowledge clearance level
• This is a follow up of: Clearance level choice for redteam member creation + warning for onboarding redteamers with clearance level below L1 #1474

Issue link

Closes #908

Proof

This step has been splitted now (introduction about clearance levels)

NEW added screen that talks about the clearance level permissions and acknowledging
Here a redteamer does not have enough clearance to continue onboarding

Screen to accept onboarding or just skip

After accepting, now one can continue onboarding

Setting clearance level comes afterwards, only focusses on setting the clearance level:

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Code Checklist

• All the commits in this PR are properly PGP-signed and verified;
• This PR only contains functionality relevant to the issue; tickets have been created for newly discovered issues.
• I have written unit tests for the changes or fixes I made.
• For any non-trivial functionality, I have added integration and/or end-to-end tests.
• I have performed a self-review of my code and refactored it to the best of my abilities.

Communication

• I have informed others of any required .env changes files if required and changed the .env-dist accordingly.
• I have made corresponding changes to the documentation, if necessary.

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Checklist for code reviewers:

Copy-paste the checklist from the docs/source/templates folder into your comment.

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Checklist for QA:

Copy-paste the checklist from the docs/source/templates folder into your comment.

[Darwinkel]

Checklist for QA:

• I have checked out this branch, and successfully ran a fresh make reset.
• I confirmed that there are no unintended functional regressions in this branch:
  • I have managed to pass the onboarding flow
  • Objects and Findings are created properly
  • Tasks are created and completed properly
• I confirmed that the PR's advertised feature or hotfix works as intended.

Nice work!

What works:

• The flow where a redteamer goes through the onboarding without sufficient clearance
• The flow where a redteamer goes through the onboarding with sufficient clearance
• No errors with regards to enabling/disabling boefjes or creating (duplicate) objects

What doesn't work:

• If one redteamer goes through the onboarding with proper clearance, and a second redteamer goes through the onboarding without proper clearance, while trying to add the same object, the following flow occurs:

Bug or feature?:

• From a UX perspective, it would be nice to include a small message/instruction ("Contact the administrator for receiving higher clearance") on the last page of the onboarding as well:

[Rieven]

• Contact the administrator for receiving higher clearance

Added more context:

Also for the last screen:

[Darwinkel]

Re-tested. Fix confirmed! :)