feat: add basic validation on stepper title

[brobro10000]

https://2u-internal.atlassian.net/browse/ENT-6497

Added validation that a title does exist before proceeding to the next step.
Retains title until the end of the stepper if they proceed
Clears title if they back out of step 1.

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[codecov]

Codecov Report

Base: 83.35% // Head: 83.37% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (6eaf2da) compared to base (e454868).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #893      +/-   ##
==========================================
+ Coverage   83.35%   83.37%   +0.01%     
==========================================
  Files         378      378              
  Lines        8386     8396      +10     
  Branches     1809     1810       +1     
==========================================
+ Hits         6990     7000      +10     
  Misses       1364     1364              
  Partials       32       32              

Impacted Files	Coverage Δ
...nts/ContentHighlights/ContentHighlightsContext.jsx	100.00% <100.00%> (ø)
...ights/HighlightStepper/ContentHighlightStepper.jsx	100.00% <100.00%> (ø)
...hlights/HighlightStepper/HighlightStepperTitle.jsx	100.00% <100.00%> (ø)
src/components/ContentHighlights/data/hooks.js	100.00% <100.00%> (ø)

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[adamstankiewicz]

Closed in favor of #895