chore(middleware): replace isFipsRegion checks with useFipsEndpoint config

[trivikr]

Issue

Internal JS-2928

Description

Reads useFipsEndpoint instead of checking for fips in region in middleware.

Testing

Unit testing

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[codecov-commenter]

Codecov Report

Merging #2988 (8358c47) into main (af5b00e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2988   +/-   ##
=======================================
  Coverage   58.76%   58.77%           
=======================================
  Files         567      567           
  Lines       30358    30364    +6     
  Branches     7481     7483    +2     
=======================================
+ Hits        17839    17845    +6     
  Misses      12519    12519           

Impacted Files	Coverage Δ
packages/middleware-bucket-endpoint/src/index.ts	100.00% <ø> (ø)
...re-bucket-endpoint/src/bucketEndpointMiddleware.ts	93.47% <100.00%> (ø)
...s/middleware-bucket-endpoint/src/bucketHostname.ts	100.00% <100.00%> (ø)
...dleware-bucket-endpoint/src/bucketHostnameUtils.ts	95.95% <100.00%> (-0.12%)	⬇️
.../process-arnables-plugin/parse-outpost-arnables.ts	97.05% <100.00%> (+0.28%)	⬆️

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[github-actions]

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