removed get_available_methods

[jpaniagualaconich]

It's been superseded by MethodRegistry.get_methods

Description

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] 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.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #539 (117c071) into master (f427f59) will increase coverage by 0.03%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #539      +/-   ##
==========================================
+ Coverage   98.28%   98.31%   +0.03%     
==========================================
  Files          62       62              
  Lines        2734     2731       -3     
  Branches      284      283       -1     
==========================================
- Hits         2687     2685       -2     
+ Misses         28       27       -1     
  Partials       19       19              

Impacted Files	Coverage Δ
tests/utils.py	100.00% <0.00%> (+3.22%)	:arrow_up:

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