Allow to configure node-saml wantAuthnResponseSigned parameter

[sbocahu]

Proposed changes

• Allow to configure node-saml's parameter wantAuthnResponseSigned when using env variables

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality

Further comments

References:

• https://github.com/node-saml/node-saml
• ! Invalid signature ! while implementing SSO in OneLogin node-saml/passport-saml#671

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c0a5db7) 66.11% compared to head (acb3a9a) 66.12%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5668   +/-   ##
=======================================
  Coverage   66.11%   66.12%           
=======================================
  Files         512      512           
  Lines       60429    60430    +1     
  Branches     4407     4408    +1     
=======================================
+ Hits        39954    39957    +3     
+ Misses      20475    20473    -2     

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