[MWPW-199553] Unity a11y fixes for prompt bar

[vipu0303]

[MWPW-199553] Unity a11y fixes for prompt bar across unity widgets

Resolves: MWPW-199553
MWPW-199555
MWPW-199557
MWPW-199558

Test URLs:

• Before: 1. https://main--da-cc--adobecom.aem.page/products/firefly?unitylibs=stage
  2. https://main--da-cc--adobecom.aem.page/products/firefly/features/ai-video-generator?unitylibs=stage
  3. https://main--da-cc--adobecom.aem.page/products/firefly/features/ai-art-generator?unitylibs=stage
  4. https://main--da-cc--adobecom.aem.page/products/firefly/features/ai-face-generator?unitylibs=stage
  5. https://main--da-cc--adobecom.aem.page/products/firefly/features/ai-voice-generator?unitylibs=stage
  6. https://main--da-cc--adobecom.aem.page/products/firefly/features/ai-painting-generator?unitylibs=stage
• After: 1. https://main--da-cc--adobecom.aem.page/products/firefly?unitylibs=mwpw-199553
  2. https://main--da-cc--adobecom.aem.page/products/firefly/features/ai-video-generator?unitylibs=mwpw-199553
  3. https://main--da-cc--adobecom.aem.page/products/firefly/features/ai-art-generator?unitylibs=mwpw-199553
  4. https://main--da-cc--adobecom.aem.page/products/firefly/features/ai-face-generator?unitylibs=mwpw-199553
  5. https://main--da-cc--adobecom.aem.page/products/firefly/features/ai-voice-generator?unitylibs=mwpw-199553
  6. https://main--da-cc--adobecom.aem.page/products/firefly/features/ai-painting-generator?unitylibs=mwpw-199553

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Commits

• fb7a8d0 ✅ (latest)
• 1ef1c31 ✅
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[asonnalagi]

Verified in the branch. All looks fine. Test results are added in the JIRA's.