fix(a11y): activate navigation components on space keyup

[uroslates]

• Closes https://jira.tools.sap/browse/CXSPA-12782.

• Addresses ACC- 270.16(Level A) _ SAP Composable Storefront_ Combo Box, Button Menu_ UI getting activated without releasing space key.

QA Steps:

• Login to the application and from Home page try the following:
  • Case1: On holding down the spacebar key on the ‘My Account’ menu button within header region and on Main Header Menu items (Brands/Digital Cameras/... carrots ), associated functionality gets activated without releasing the respective key.
  • Case2: On holding down the spacebar key on the Language, Currency and Theme Combo Boxes within header region, associated functionality gets activated without releasing the respective key.

Expected Behavior:

• On holding down the spacebar key on the ‘Combo Boxes’ and ‘Menu Button’ within Header, associated functionality should not be triggered without releasing the respective key.

Once a11yNavigationSpaceKeyOnKeyUp feature flag is enabled the issues should not be there! When off they are reproducible again.

IMPORTANT: This PR is in addition to other custom components addresses Language/Currency & Theme native selector issues (which are Browser specific) by adding ngSelect for those (if toggle is ON).
NOTE: Its addition to PR #21781 (adds select -> ngSelect conversion on top of PR.j

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