[REFACTOR] `argilla server`: Remove passlib dependency

[frascuchon]

Description

Closes https://github.com/argilla-io/argilla/issues/5664

Type of change

• Improvement (change adding some improvement to an existing functionality)

How Has This Been Tested

Checklist

• I added relevant documentation
• I followed the style guidelines of this project
• I did a self-review of my code
• I made corresponding changes to the documentation
• I confirm My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.09%. Comparing base (31b3c6a) to head (0c10421). Report is 2 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #5674 +/- ## ======================================== Coverage 91.08% 91.09% ======================================== Files 150 150 Lines 6250 6253 +3 ======================================== + Hits 5693 5696 +3 Misses 557 557 ``` | [Flag](https://app.codecov.io/gh/argilla-io/argilla/pull/5674/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=argilla-io) | Coverage Δ | | |---|---|---| | [argilla-server](https://app.codecov.io/gh/argilla-io/argilla/pull/5674/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=argilla-io) | `91.09% <100.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=argilla-io#carryforward-flags-in-the-pull-request-comment) to find out more.

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[github-actions[bot]]

Docs for this PR have been deployed hidden from versioning: https://docs.argilla.io/docs_deploy_on_spaces