tests(steps): add axe tests, correct steps aria

[mmazanec22]

An example of using Deque's axe library (via jest-axe) to test accessibility for a component (see #596 ). Also fixes an accessibility issue for the steps component. Modeled after #841, assuming that more tests will be added following this pattern.

Proposed Changes

• Use jest-axe to test accessibility of the Steps component given different props scenarios
• Remove the aria-orientation role, as it is not valid on this component
• Add the aria-current property

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[codecov]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 10.52%. Comparing base (484cfe8) to head (7edf5c1).
Report is 26 commits behind head on develop.

Files	Patch %	Lines
.../oruga/src/components/steps/tests/StepsExample.vue	71.42%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #846       +/-   ##
============================================
- Coverage    56.71%   10.52%   -46.20%     
============================================
  Files           30      110       +80     
  Lines         1511     5273     +3762     
  Branches       544     1917     +1373     
============================================
- Hits           857      555      -302     
- Misses         654     3740     +3086     
- Partials         0      978      +978     

Flag	Coverage Δ
oruga-next	10.52% <73.33%> (-46.20%)	⬇️

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