python311Packages.flask-principal: refactor and remove nose

[natsukium]

Description of changes

part of #311054

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

---

Add a 👍 reaction to pull requests you find important.

[natsukium]

Result of nixpkgs-review pr 317167 at 7cfd6b9 run on x86_64-linux 1

6 packages built successfully:

• calibre-web
• pgadmin4
• pgadmin4-desktopmode
• python311Packages.flask-principal
• python311Packages.flask-security-too
• python312Packages.flask-principal

[fabaff]

Result of nixpkgs-review pr 317167 run on x86_64-linux 1

12 packages built:

• calibre-web
• calibre-web.dist
• pgadmin4
• pgadmin4-desktopmode
• pgadmin4-desktopmode.dist
• pgadmin4.dist
• python311Packages.flask-principal
• python311Packages.flask-principal.dist
• python311Packages.flask-security-too
• python311Packages.flask-security-too.dist
• python312Packages.flask-principal
• python312Packages.flask-principal.dist

[fabaff]

Change looks good to me.