ICMSLST-171 Add support for GOV.UK One Login Back Channel Logout.

[MattHolmes123]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.13%. Comparing base (2c8a45e) to head (c2ffca3).

Files with missing lines	Patch %	Lines
web/one_login/views.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1939      +/-   ##
==========================================
- Coverage   91.13%   91.13%   -0.01%     
==========================================
  Files         292      292              
  Lines       23504    23509       +5     
  Branches     3422     3422              
==========================================
+ Hits        21421    21425       +4     
- Misses       2083     2084       +1     

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