[terra-form-select] Fix Search field value clears out issue

[adavijit]

Summary

What was changed:

• When moving to some other component the Search Field gets onBlur event. onBlur event the state change is now removed.

Why it was changed: Ensured search field value persists when navigating to another component to improve user experience by retaining search context.

Testing

This change was tested using:

• [x] WDIO
• [x] Jest
• [ ] Visual testing (please attach a screenshot or recording)
• [ ] Other (please describe below)
• [ ] No tests are needed

Reviews

In addition to engineering reviews, this PR needs:

• [ ] UX review
• [ ] Accessibility review
• [ ] Functional review

Additional Details

This PR resolves:

UXPLATFORM-10430

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