fix: Fixing the logic to return instanceCount for heterogeneousClusters

[asumitamazon]

We recently started supporting feature for heterogeneousClusters and missed this part where we return instanceCount from ResourceConfig -> InstanceType For heterogeneousCluster jobs the total instanceCount is sum total of the instanceCount of all the instance groups. Fixing the same.

Issue #, if available:

Description of changes:

Testing done:

Merge Checklist

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
• Commit ID: 6754ef9910294cf5fdb7787cfeb384608f2ac2a4
• Result: FAILED
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 6754ef9910294cf5fdb7787cfeb384608f2ac2a4
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: 6754ef9910294cf5fdb7787cfeb384608f2ac2a4
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[codecov-commenter]

Codecov Report

Merging #3363 (6754ef9) into master (ace07d7) will decrease coverage by 0.86%. The diff coverage is 40.00%.

@@            Coverage Diff             @@
##           master    #3363      +/-   ##
==========================================
- Coverage   90.02%   89.15%   -0.87%     
==========================================
  Files         868      204     -664     
  Lines       76852    18983   -57869     
==========================================
- Hits        69185    16925   -52260     
+ Misses       7667     2058    -5609     

Impacted Files	Coverage Δ
src/sagemaker/session.py	71.52% <40.00%> (ø)
...b/python3.8/site-packages/sagemaker/local/image.py
.../site-packages/sagemaker/model_monitor/__init__.py
...on3.8/site-packages/sagemaker/debugger/__init__.py
...thon3.9/site-packages/sagemaker/apiutils/_utils.py
...agemaker/async_inference/async_inference_config.py
...te-packages/sagemaker/dataset_definition/inputs.py
...-packages/sagemaker/dataset_definition/__init__.py
...n3.9/site-packages/sagemaker/workflow/utilities.py
...agemaker/serverless/serverless_inference_config.py
... and 1063 more

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AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 6754ef9910294cf5fdb7787cfeb384608f2ac2a4
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: 6754ef9910294cf5fdb7787cfeb384608f2ac2a4
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[shreyapandit]

Merging with override as airflow test failure is unrelated and intermittent.