fix: Post one "Like" activity with multiple URIs in "to" field

[bstasyszyn]

Instead of posting two "Like" activities, post one activity with multiple URIs in the "to" field.

Also:

• Fix the WebFinger CAS query to return 400 (bad request) instead of 500 in the CID isn't in the request.
• Added more logging in BDD test to also log the error message.

Signed-off-by: Bob Stasyszyn Bob.Stasyszyn@securekey.com

[codecov]

Codecov Report

Merging #787 (ad11199) into main (b85cf8d) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #787      +/-   ##
==========================================
+ Coverage   89.92%   89.93%   +0.01%     
==========================================
  Files         140      139       -1     
  Lines       11864    11856       -8     
==========================================
- Hits        10669    10663       -6     
+ Misses        737      736       -1     
+ Partials      458      457       -1     

Impacted Files	Coverage Δ
pkg/discovery/endpoint/restapi/operations.go	92.65% <100.00%> (+0.10%)	⬆️
pkg/observer/observer.go	83.24% <100.00%> (+1.04%)	⬆️
cmd/orb-server/startcmd/params.go	80.65% <0.00%> (-0.23%)	⬇️
pkg/ldcontextrest/ldcontextrest.go
cmd/orb-server/startcmd/start.go	73.78% <0.00%> (+0.25%)	⬆️

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