chore: use Array shorthand syntax

[trivikr]

Issue #, if available:

• Fixes: Use short-hand syntax Type[] instead of Array<Type> #1126
• Refs: Use Array shorthand - Type[] instead of Array<Type> smithy-lang/smithy-typescript#168

Description of changes:
CodeGen for using Array shorthand syntax

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: d2691b8
• Result: SUCCEEDED
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[codecov-io]

Codecov Report

Merging #1127 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1127      +/-   ##
==========================================
- Coverage   73.54%   73.54%   -0.01%     
==========================================
  Files         283      284       +1     
  Lines       13014    13021       +7     
  Branches     3030     3033       +3     
==========================================
+ Hits         9571     9576       +5     
- Misses       3443     3445       +2     

Impacted Files	Coverage Δ
packages/util-body-length-browser/src/index.ts	71.42% <0.00%> (ø)

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[AllanZhengYP]

Another way to type the array. Looks good to me.

[lock]

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