Refactor AWS docker id fetch

[jtduffy]

Overview

Refactor the code used to fetch the AWS Fargate docker ID to use URLConnection, which allows a sane timeout value to be assigned for the connect sequence.

Resolves #2247

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 70.54%. Comparing base (83666de) to head (8b4eaad).

Files with missing lines	Patch %	Lines
...c/agent/utilization/AwsFargateMetadataFetcher.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2275      +/-   ##
============================================
- Coverage     70.54%   70.54%   -0.01%     
- Complexity    10021    10022       +1     
============================================
  Files           844      844              
  Lines         40569    40572       +3     
  Branches       6148     6148              
============================================
+ Hits          28618    28620       +2     
- Misses         9169     9171       +2     
+ Partials       2782     2781       -1     

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