UML-3056 initial code and working test

[MishNajam]

Purpose

Service and Handler classes created in the service api layer that returns an authorisation uri string in the following format:

Source

Fixes UML-3056

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 #2360 (709c994) into main (d7694e9) will increase coverage by 0.03%.
The diff coverage is 100.00%.

❗ Current head 709c994 differs from pull request most recent head f93f7ba. Consider uploading reports for the commit f93f7ba to get more accurate results

@@             Coverage Diff              @@
##               main    #2360      +/-   ##
============================================
+ Coverage     91.96%   92.00%   +0.03%     
- Complexity     1455     1457       +2     
============================================
  Files           274      275       +1     
  Lines          6597     6629      +32     
============================================
+ Hits           6067     6099      +32     
  Misses          513      513              
  Partials         17       17              

Flag	Coverage Δ
use-an-lpa-admin	88.81% <ø> (ø)
use-an-lpa-api	96.81% <100.00%> (+0.04%)	⬆️
use-an-lpa-front	89.19% <ø> (ø)

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Files	Coverage Δ
...entication/OneLoginAuthorisationRequestService.php	100.00% <100.00%> (ø)