feat: Change Fabric Cog Service Token to Support Billing

[lhrotk]

What changes are proposed in this pull request?

For both openai and cognitive transformers, need shift to use another MWC Token issued by spark core workload in Fabric which contains billing info.
The old mwc token will get rejected soon.

How is this patch tested?

Manually tested in Fabric

Does this PR change any dependencies?

• No. You can skip this section.
• Yes. Make sure the dependencies are resolved correctly, and list changes here.

Does this PR add a new feature? If so, have you added samples on website?

• No. You can skip this section.
• Yes. Make sure you have added samples following below steps.

[lhrotk]

/azp run

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Project coverage is 84.52%. Comparing base (6854b5f) to head (ec12ada).

Files with missing lines	Patch %	Lines
...crosoft/azure/synapse/ml/fabric/TokenLibrary.scala	0.00%	16 Missing ⚠️
...crosoft/azure/synapse/ml/fabric/FabricClient.scala	0.00%	3 Missing ⚠️
...ure/synapse/ml/services/CognitiveServiceBase.scala	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2291      +/-   ##
==========================================
+ Coverage   83.70%   84.52%   +0.82%     
==========================================
  Files         327      326       -1     
  Lines       16788    16769      -19     
  Branches     1500     1502       +2     
==========================================
+ Hits        14052    14174     +122     
+ Misses       2736     2595     -141     

Flag	Coverage Δ
	82.21% <0.00%> (?)

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[lhrotk]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).