[Kingston] Changes to container request emails

[davea]

• New logo for all Kingston emails
• Added some text to container request emails
• Added link to request status page to container request emails

For FD-3630 (aka https://github.com/mysociety/societyworks/issues/4221)
Feedback given in https://mysocietysupport.freshdesk.com/a/tickets/4056

[skip changelog]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.59%. Comparing base (4c4efdd) to head (132a02e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4898      +/-   ##
==========================================
- Coverage   82.59%   82.59%   -0.01%     
==========================================
  Files         392      392              
  Lines       30647    30647              
  Branches     4845     4845              
==========================================
- Hits        25314    25312       -2     
- Misses       3891     3893       +2     
  Partials     1442     1442              

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[dracos]

Also need to add the track link to the alert-update.txt template as well.

[dracos]

Two tiny tweaks is all :)