chore(clients): populate regionRegex in partitionHash

[trivikr]

Issue

Internal JS-2904

Description

Populates regionRegex in partitionHash.
The regionRegex is required to read signingRegion from hostname.

Testing

N/A

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[codecov-commenter]

Codecov Report

Merging #2933 (ede4aeb) into main (74e25df) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2933   +/-   ##
=======================================
  Coverage   58.57%   58.57%           
=======================================
  Files         558      558           
  Lines       30249    30249           
  Branches     7443     7443           
=======================================
  Hits        17719    17719           
  Misses      12530    12530           

Impacted Files	Coverage Δ
...lients/client-lex-runtime-service/src/endpoints.ts	100.00% <ø> (ø)
clients/client-mediastore-data/src/endpoints.ts	100.00% <ø> (ø)
clients/client-s3-control/src/endpoints.ts	100.00% <ø> (ø)
clients/client-sts/src/endpoints.ts	100.00% <ø> (ø)
...ig-resolver/src/regionInfo/getResolvedPartition.ts	100.00% <ø> (ø)
protocol_tests/aws-ec2/src/endpoints.ts	100.00% <ø> (ø)
protocol_tests/aws-json-10/src/endpoints.ts	100.00% <ø> (ø)
protocol_tests/aws-json/src/endpoints.ts	100.00% <ø> (ø)
protocol_tests/aws-query/src/endpoints.ts	100.00% <ø> (ø)
protocol_tests/aws-restjson/src/endpoints.ts	100.00% <ø> (ø)
... and 1 more

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[github-actions]

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