ISSUE-48435: Cleanup obsolete IE support code

Internet Explorer is no longer supported since 22Q1

We can now cleanup code/workarounds we have in lots of places related to it.

Apart from cleaning up unused code-path. Reduces number of 'navigator.userAgent' references in backoffice from 102 down to 64

try-run: https://builds.openbravo.com/view/try/job/try-init/1198/

Related topics split out to their own issues:

Edited by Stefan Huehner