MudStepper: Add opt-out Ripple property

[danielchalmers]

Description

• Adds Ripple property, true by default, along with a switch in the NonLinear example to try it
• The mud-step-disabled class was removed and now the disabled button attribute is used
• The step button now has type="button" defined to fix accessibility warning
• Makes styles use library mud-clickable
• Ripple is now highlighted with the text color
• Allows selection of the step text if it's not acting as a button

How Has This Been Tested?

unit

Type of Changes

• 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 not work as expected)
• Documentation (fix or improvement to the website or code docs)

video6.mp4

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.10%. Comparing base (6ac51c8) to head (6e0dab9).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #10060   +/-   ##
=======================================
  Coverage   91.10%   91.10%           
=======================================
  Files         410      410           
  Lines       12476    12477    +1     
  Branches     2421     2421           
=======================================
+ Hits        11366    11367    +1     
  Misses        565      565           
  Partials      545      545           

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[henon]

Good job. Thanks @danielchalmers !