chore(clients): remove hostname key from endpoint hashes

[trivikr]

Issue

Follow-up to #2989

Description

Removes hostname key from hashes as the value is populated as a default variant:

• Variants were populated in feat(clients): populate variants in endpoints hashes #2974
• Hostname was resolved from variants in feat(config-resolver): resolve hostname from variants #2980

Testing

Functional testing

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[codecov-commenter]

Codecov Report

Merging #2990 (f1ccfdc) into remove-deprecated-endpoints (d3f1abc) will not change coverage.
The diff coverage is n/a.

@@                     Coverage Diff                      @@
##           remove-deprecated-endpoints    #2990   +/-   ##
============================================================
  Coverage                        58.76%   58.76%           
============================================================
  Files                              567      567           
  Lines                            30358    30358           
  Branches                          7481     7481           
============================================================
  Hits                             17839    17839           
  Misses                           12519    12519           

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)
private/aws-protocoltests-ec2/src/endpoints.ts	100.00% <ø> (ø)
private/aws-protocoltests-json-10/src/endpoints.ts	100.00% <ø> (ø)
private/aws-protocoltests-json/src/endpoints.ts	100.00% <ø> (ø)
private/aws-protocoltests-query/src/endpoints.ts	100.00% <ø> (ø)
...rivate/aws-protocoltests-restjson/src/endpoints.ts	100.00% <ø> (ø)
private/aws-protocoltests-restxml/src/endpoints.ts	100.00% <ø> (ø)

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[github-actions]

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