fix: Mediated Connection - Decrypt invitation request at Invitee's as No-Auth

[mkempa]

This PR fixes an issue when Invitee is unable to decrypt connection request downloaded from mediator. The request was being attempted to decrypt as Auth when in fact it should still be No-Auth.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a7bac93) 0.05% compared to head (efed260) 0.05%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #1087      +/-   ##
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- Coverage   0.05%   0.05%   -0.01%     
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  Files        471     471              
  Lines      24019   24093      +74     
  Branches    4295    4332      +37     
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  Hits          13      13              
- Misses     24005   24079      +74     
  Partials       1       1              

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unittests-aries-vcx	0.05% <ø> (-0.01%)	⬇️

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[Patrik-Stas]

Hi @mkempa much appreciated first contribution!

A small technical comment - Perhaps you've run into some edge case, things worked in past without this change, but I think this does no harm. - CI is passing and the Mediated Connection is generally not used anymore (though Mediated Connection is still getting tested indirectly in our NodeJS wrapper tests).

So merging ✅