🔥 Remove IE specific code

[josemigallas]

Internet explorer is no longer maintained/supported by Microsoft. 3scale has never officially supported however there are some hacks here and there to make it work. This is a technical debt that degrades our codebase and we should clean it up.

THREESCALE-8613: Clean up IE11 code

Our server still gets requests from IE and Windows Phone browsers but most must should come from automated test. If any customer still uses IE we announced end of support in 2020.

[josemigallas]

~According to Kibana there were no logs during the last month with an user agent that points to Internet Explorer [1]~ ~Screenshot 2022-08-29 at 13 03 29~ ~[1] - see https://www.whatismybrowser.com/guides/the-latest-user-agent/internet-explorer~

UPDATE:

Our server gets thousands of requests from IE browsers each month. Versions goes from 6 to 11... and there are also requests made from Windows Phones. IMO most of these requests must be done by some automated tests in case some customer is affected we stopped supporting IE11 since 2020 so we should not worry.

[josemigallas]

Force pushed because the commits were not signed.