fix(discount-code-importer): improve error logging

[VineetKumarKushwaha]

Improve Error Logging for Discount Importer in Impex

• Pass error message to the consumer. Currently in impex we only see the generic coming from the Discount Importer. So with this PR we are also pushing specific error message in the array which we show in the UI

Fix: #1832

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 79ae08ef12991e6b85d199e03a1f834218c6b3e3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------------------------- | ----- | | @commercetools/discount-code-importer | Patch |

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[codecov[bot]]

Codecov Report

Merging #1833 (79ae08e) into master (bf1af7c) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1833   +/-   ##
=======================================
  Coverage   94.64%   94.64%           
=======================================
  Files         145      145           
  Lines        4912     4914    +2     
  Branches     1338     1339    +1     
=======================================
+ Hits         4649     4651    +2     
  Misses        260      260           
  Partials        3        3           

Impacted Files	Coverage Δ
packages/discount-code-importer/src/main.js	100.00% <100.00%> (ø)

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