refactor: Move registry.get_methods() call to separate method, to all…

[last-partizan]

…ow customization

Refs #533

Description

This PR replaces direct call to registry.get_methods() with self.get_available_methods() in SetupView, to allow customization if methods available for setup depending on user.

How Has This Been Tested?

This does not introduce any new behaviour, already covered by normal unit tests.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[claudep]

Looks fine to me.

[codecov]

Codecov Report

Merging #535 (59a01e8) into master (f427f59) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #535   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files          62       62           
  Lines        2734     2736    +2     
  Branches      284      284           
=======================================
+ Hits         2687     2689    +2     
  Misses         28       28           
  Partials       19       19           

Impacted Files	Coverage Δ
two_factor/views/core.py	97.18% <100.00%> (+0.01%)	⬆️

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