[MWPW-165782] - Hamburger icon issue fix

[Deva309]

1. Fix for close icon which is seen replaced with hamburger after the new mobile GNAV code changes
2. Fix for GNAV height issue in case of app banner is present on the page.
3. Made the header sticky in mobile with newNav disabled

Resolves: MWPW-165782

Test URLs:

• Before: https://main--milo--adobecom.aem.page/?martech=off
• After: https://mwpw-165782--milo--deva309.aem.page/?martech=off

QA:
https://main--cc--adobecom.hlx.page/products/photoshop?newNav=false (before fix)
https://main--cc--adobecom.hlx.page/products/photoshop?newNav=false&milolibs=mwpw-165782--milo--deva309 (After fix)

https://main--cc--adobecom.hlx.page/products/photoshop-lightroom?milolibs=mwpw-165782--milo--deva309 (app banner issue fix)
https://main--federal--adobecom.hlx.page/federal/dev/blaishram/page-with-promo?milolibs=mwpw-165782--milo--deva309 (stickyheader with newNav disabled)

[aem-code-sync]

	Page	Scores	Audits	Google
📱	/?martech=off
🖥️	/?martech=off

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.47%. Comparing base (6eb0401) to head (328d1f1).
Report is 4 commits behind head on stage.

Additional details and impacted files

@@           Coverage Diff           @@
##            stage    #3501   +/-   ##
=======================================
  Coverage   96.47%   96.47%           
=======================================
  Files         258      258           
  Lines       60150    60151    +1     
=======================================
+ Hits        58029    58033    +4     
+ Misses       2121     2118    -3     

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[github-actions]

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[prativas22]

Verified the fixes for the issues below; the result looks good.
Close icon which is seen replaced with hamburger
GNAV height issue in case of app banner is present on the page
Header stickyness in mobile with promo and newNav disabled

CC:
https://main--cc--adobecom.hlx.page/drafts/prativa/promobar/mobileredesignpromobar?milolibs=mwpw-165782--milo--deva309&newNav=true

https://main--cc--adobecom.hlx.page/drafts/prativa/Promobar/aside-promo-bar?milolibs=mwpw-165782--milo--deva309&newNav=true

https://main--cc--adobecom.hlx.page/products/photoshop-lightroom?milolibs=mwpw-165782--milo--deva309&newNav=true

DC:
https://main--dc--adobecom.hlx.page/acrobat/hub/how-to-convert-heic-to-jpg-on-a-mac?milolibs=mwpw-165782--milo--deva309&newNav=true

https://main--dc--adobecom.hlx.page/acrobat?milolibs=mwpw-165782--milo--deva309&newNav=true

[milo-pr-merge]

Skipped merging 3501: [MWPW-165782] - Hamburger icon issue fix due to failing checks

[milo-pr-merge]

Skipped 3501: "[MWPW-165782] - Hamburger icon issue fix" due to file "libs/utils/utils.js" overlap. Merging will be attempted in the next batch