fix: search blur state for every single charater input

[leangseu-edx]

TL;DR - fix search bar to remain focus on every keyboard input

JIRA: AU-723

What changed?

• Instead of using onChange, we use onBlur and onSubmit to accommodate the use case. I also tested with this.setState but was unsuccessful
• NOTE: This approach was trying to preserve the behavior/design choice for the interaction between search bar and filter side panel

Developer Checklist

• [x] Test suites passing
• [ ] Documentation and test plan updated, if applicable
• [x] Received code-owner approving review
• [ ] Bumped version number package.json

Testing Instructions

[ How should a reviewer test this PR? ]

Reviewer Checklist

Collectively, these should be completed by reviewers of this PR:

• [ ] I've done a visual code review
• [ ] I've tested the new functionality

FYI: @openedx/content-aurora

[codecov[bot]]

Codecov Report

Merging #250 (7221553) into master (a75f365) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #250   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          108       108           
  Lines         1255      1259    +4     
  Branches       247       247           
=========================================
+ Hits          1255      1259    +4     

Impacted Files	Coverage Δ
src/components/GradesView/SearchControls.jsx	100.00% <100.00%> (ø)

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