fix: Show Location, Online Event, Mixed Event or To be Announced info correctly

[sachinchauhan2889]

Fixes fossasia/open-event-frontend#5614

Short description of what this resolves:

This PR update the area to show the information according to the attendee pdf as follows:

• When an event has a location, show "At" and the location behind.
• When an event is an online event show "Online Event"
• When the event is a mixed event show "Event taking place online and at [location here]."
• When an event location or online details are "to be announced" show: "Location or online event details to be announced".

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

screenshots

[codecov]

Codecov Report

Merging #7447 (15477ad) into development (af5d617) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #7447   +/-   ##
============================================
  Coverage        65.35%   65.35%           
============================================
  Files              265      265           
  Lines            13225    13225           
============================================
  Hits              8643     8643           
  Misses            4582     4582           

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[iamareebjamal]

What about ticket_purchaser.html?

[sachinchauhan2889]

What about ticket_purchaser.html?

@iamareebjamal sir, done.