use cm.namespace when generating contract URL's

[shorsher]

Fixes error where namespace was not set when resolving contract API on create. This resulted in contract listener url's being broken in the POST response.

When generating contract URL's, always use the ContractManager namespace.

closes #1067

[codecov-commenter]

Codecov Report

Merging #1070 (0347bd2) into main (1f31807) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 0347bd2 differs from pull request most recent head 58a2014. Consider uploading reports for the commit 58a2014 to get more accurate results

@@           Coverage Diff           @@
##             main    #1070   +/-   ##
=======================================
  Coverage   99.99%   99.99%           
=======================================
  Files         307      307           
  Lines       20294    20294           
=======================================
  Hits        20292    20292           
  Misses          2        2           

Impacted Files	Coverage Δ
internal/definitions/sender_contracts.go	100.00% <100.00%> (ø)

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