Fix SpeechToTextSDK setLinedService Error

[xuwq1993]

Error:

SpeechToText didn't support endpoint like: https://wenqxcogserv.cognitiveservices.azure.com/

It only support https://{location}.api,cognitive.microsoft.com/ like: https://eastus.api.cognitive.microsoft.com/

Also, SpeechToText don't support DEP Vnet, therefore, we don't need to consider the PE problems.

[xuwq1993]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #1138 (1d7bc04) into master (87ec5f7) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1138      +/-   ##
==========================================
- Coverage   85.35%   85.31%   -0.05%     
==========================================
  Files         257      257              
  Lines       12053    12061       +8     
  Branches      629      632       +3     
==========================================
+ Hits        10288    10290       +2     
- Misses       1765     1771       +6     

Impacted Files	Coverage Δ
...microsoft/ml/spark/cognitive/SpeechToTextSDK.scala	87.83% <0.00%> (-1.98%)	⬇️

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[xuwq1993]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mhamilton723]

can we make setLinkedService a trait and mix in in both places?