replaced registry cypress tests with equivalent pytest (#402)

[cyplas]

Detailed information:

Replaced the cypress register tests with equivalent pytest ones (except for the limiter aspects, as in #396)

Closing issues:

List all issues the pull request solve:

• #402

Test plan (required)

• [X] The PR contains new PyTest unit/integration tests for any function or functional added.
• [X] The PR changes existing PyTest unit/integration tests to keep all tests up to date.
• [X] The PR does not lead to degradation in unit test coverage.
• [X] Project parts affected by changes in this PR was tested manually on your local (using Postman or in any other way). List everything you've tested below:
  • app/auth/tests/test_auth_routes.py

[codecov-commenter]

Codecov Report

Base: 74.15% // Head: 74.30% // Increases project coverage by +0.14% :tada:

Coverage data is based on head (17fd65e) compared to base (1ee19f0). Patch has no changes to coverable lines.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #486 +/- ## =========================================== + Coverage 74.15% 74.30% +0.14% =========================================== Files 85 85 Lines 2681 2681 Branches 315 315 =========================================== + Hits 1988 1992 +4 + Misses 659 657 -2 + Partials 34 32 -2 ``` | [Impacted Files](https://codecov.io/gh/ClimateMind/climatemind-backend/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ClimateMind) | Coverage Δ | | |---|---|---| | [app/auth/routes.py](https://codecov.io/gh/ClimateMind/climatemind-backend/pull/486?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ClimateMind#diff-YXBwL2F1dGgvcm91dGVzLnB5) | `76.63% <0.00%> (+3.73%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ClimateMind). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ClimateMind)

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