[DO NOT MERGE] chore!: replace pytz with zoneinfo

[ttak-apphelix]

chore!: replace pytz with zoneinfo

[chintanjoshi-apphelix-2u]

@ttak-apphelix

I believe that this is a big change. It'd be difficult to review as well as test. So this can be broken down into multiple parts

What can be done instead is,

• Core changes go first
• Then we start by each app (i.e. lms,cms .. etc)
• Then with the .html files (Which might be not needed as lots of files are being removed and replaced with MFEs)
• And the last stage we remove pytz dependency from requirements.

This will help in testing as well. Because testing these altogether is a bit difficult.

Also, there needs to be some discussion and some noise around this as well ? Because this change is something that is affecting whole platform. Tickets and DEPRs may exist around it, if so we can link those, if not we can start creating some noise around it. Basically this should not go as a whole without some discussion around it.