UML-3106 Implement One Login callback handler on service-front

[MishNajam]

Purpose

Handles when an error is returned from One Login. This will either:

• on an access denied or temporarily unavailable error return the user to the login page with an error message
• on any other error send the user to the generic error page

Other changes:

• Stores the redirect_uri in the auth session
• Adds an override to the redirect method to return the page in Welsh if it is set
• Replaced deprecated method assertObjectHasAttribute with assertObjectHasProperty

Fixes UML-3106

Checklist

• I have performed a self-review of my own code
• I have added relevant logging with appropriate levels to my code

• New event_codes have been documented on the wiki page
• I have updated documentation (Confluence/GitHub wiki/tech debt doc) where relevant

• I have added tests to prove my work

• I have added welsh translation tags and updated translation files
• I have run an accessibility tool on any pages I have made changes to and fixed any issues found

• I have notified the Interaction Designer of any content changes so that appropriate screenshots/flow diagram changes can be made

• The product team have tested these changes

[codecov]

Codecov Report

Merging #2445 (f45d7f9) into main (1327c6f) will increase coverage by 0.06%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2445      +/-   ##
============================================
+ Coverage     91.88%   91.94%   +0.06%     
+ Complexity     1467     1466       -1     
============================================
  Files           279      278       -1     
  Lines          6653     6653              
============================================
+ Hits           6113     6117       +4     
+ Misses          523      519       -4     
  Partials         17       17              

Flag	Coverage Δ
use-an-lpa-admin	88.81% <ø> (ø)
use-an-lpa-api	96.80% <ø> (+0.18%)	⬆️
use-an-lpa-front	89.11% <100.00%> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...vice-front/app/src/Actor/src/Form/OneLoginForm.php	100.00% <ø> (ø)
...rc/Common/src/Service/OneLogin/OneLoginService.php	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes