[WIP] chore(clients): remove redundant endpoint configuration from PartitionHash

[trivikr]

Issue

Noticed while working on variants in #2962

Description

• Removes redundant endpoint configuration from PartitionHash.
• Populates signingRegion in PartitionHash instead.
• Removes redundant configuration from RegionHash.
• Updates getRegionInfo.

Testing

Unit testing

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[codecov-commenter]

Codecov Report

Merging #2965 (96f93e0) into main (abe4ed9) will not change coverage.
The diff coverage is n/a.

❗ Current head 96f93e0 differs from pull request most recent head 0987625. Consider uploading reports for the commit 0987625 to get more accurate results

@@           Coverage Diff           @@
##             main    #2965   +/-   ##
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  Coverage   58.60%   58.60%           
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  Files         561      561           
  Lines       30272    30272           
  Branches     7452     7452           
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  Hits        17742    17742           
  Misses      12530    12530           

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[trivikr]

Closing as clients can provide partition endpoint as region, an issue which was identified while working on this PR and fixed in #2969

[github-actions]

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