Added scriptOrigin parameter for signoutSIlent to work from another origin

[davidmrobins]

Fixes #1172

Checklist

• This PR makes changes to the public API
• I have included links for closing relevant issue numbers

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b91de25) 77.92% compared to head (074cb31) 77.92%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1173   +/-   ##
=======================================
  Coverage   77.92%   77.92%           
=======================================
  Files          45       45           
  Lines        1726     1726           
  Branches      346      346           
=======================================
  Hits         1345     1345           
  Misses        342      342           
  Partials       39       39           

Flag	Coverage Δ
unittests	77.92% <ø> (ø)

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Files Changed	Coverage Δ
src/UserManager.ts	57.87% <ø> (ø)

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[pamapa]

thanks for contributing