fix(text-field): Moved VALIDATION_ATTR_WHITELIST to constants.

[abhiomkar]

No description provided.

[codecov-io]

Codecov Report

Merging #2808 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #2808   +/-   ##
=======================================
  Coverage   98.48%   98.48%           
=======================================
  Files          98       98           
  Lines        4232     4232           
  Branches      538      538           
=======================================
  Hits         4168     4168           
  Misses         64       64

Impacted Files	Coverage Δ
packages/mdc-textfield/foundation.js	98.88% <ø> (-0.01%)	⬇️
packages/mdc-textfield/constants.js	100% <100%> (ø)	⬆️

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[moog16]

LGTM! Are you doing the React fix? I saw a card with your name on it. Can you please remember/document to use this whitelist?

[abhiomkar]

Yes, I'm doing React fix followed by this change. We don't need to use this constant in React anymore because the new handleAttributeChange change will do that for us. :)