feat: remove border radius & extra content

[filippovskii09]

Description

In this PR was added style fixes for Search Submit Button

Issues

#2674
#4023

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After:

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.38%. Comparing base (dfc69e2) to head (24df154).
⚠️ Report is 4 commits behind head on release-23.x.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-23.x    #4083      +/-   ##
================================================
- Coverage         94.39%   94.38%   -0.01%     
================================================
  Files               242      242              
  Lines              4296     4294       -2     
  Branches           1020      981      -39     
================================================
- Hits               4055     4053       -2     
  Misses              237      237              
  Partials              4        4              

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[PKulkoRaccoonGang]

I checked, it seems to look much better now. Thanks for this fix!

[brian-smith-tcril]

We should probably just remove this completely. We already have a default for buttonText in SearchField.SubmitButton

paragon/src/SearchField/SearchFieldSubmitButton.jsx

Lines 70 to 74 in d2dc235

	SearchFieldSubmitButton.defaultProps = {
	variant: 'light',
	submitButtonLocation: 'internal',
	buttonText: 'Search',
	};

So it'd be nice to not have this defined in 2 places.

[filippovskii09]

The SEARCH_FIELD_BUTTON_TEXT variable has been removed