Feature/join by code approvals

[Iloveall]

Description

Fixes #1675

Notes (out of scope, known isues, hints for reviewing code, ...) (optional)

...

Test cases

• [ ] Case 1:
  1. Given I am the usual user
  2. When I go to this page
  3. And I click on "Lock membership until a given date"
  4. Then I see input date
  5. Then I set future date
  6. Then I click "Managers can access member's personal information" to "Read Only"
  7. Then I click on "Save" button
  8. Then I see successful notification
  9. Then I login as demouser
  10. And I go to this page
  11. Then I scroll down to "Join a group by code" section
  12. Then I put code "66vd8cn94m" and click on "Join" button
  13. Then I see confirmation with approvals

[smadbe]

[auto-generated message] E2E test report on: https://algorea-static.s3.eu-central-1.amazonaws.com/branch/feature/join-by-code-approvals/playwright-report/index.html

[smadbe]

[auto-generated message] E2E test report on: https://algorea-static.s3.eu-central-1.amazonaws.com/branch/feature/join-by-code-approvals/playwright-report/index.html

[smadbe]

[auto-generated message] E2E test report on: https://algorea-static.s3.eu-central-1.amazonaws.com/branch/feature/join-by-code-approvals/playwright-report/index.html

[smadbe]

For this kind of PR where it is useful I fully test the feature and the tests are not trivial, I think it would make sense to give ,in the PR description, a bit of a test scenario (at the least the way to make to the modal) (without covering all scenarios)

[smadbe]

[auto-generated message] E2E test report on: https://algorea-static.s3.eu-central-1.amazonaws.com/branch/feature/join-by-code-approvals/playwright-report/index.html