change: Allow either instance_type or instance_group to be defined in…

[rohithn1]

… distributed training config.

Issue #, if available:

Description of changes:
Allowing distribution configurations for a distributed training job to define either instance_type or instance_group.

Testing done:
Ran all unit, integration tests and pre-commit checks.

Merge Checklist

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General

• I have read the CONTRIBUTING doc
• I certify that the changes I am introducing will be backward compatible, and I have discussed concerns about this, if any, with the Python SDK team
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Tests

• I have added tests that prove my fix is effective or that my feature works (if appropriate)
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• I have used unique_name_from_base to create resource names in integ tests (if appropriate)

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[0x6b64]

LGTM!

[viclzhu]

LGTM!

[mufaddal-rohawala]

/bot run all

[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: f034641
• Result: SUCCEEDED
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-notebook-tests
• Commit ID: f034641
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: f034641
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-slow-tests
• Commit ID: f034641
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: f034641
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[codecov-commenter]

Codecov Report

Attention: 69 lines in your changes are missing coverage. Please review.

Comparison is base (3057f21) 90.27% compared to head (f034641) 90.31%.
Report is 63 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4232      +/-   ##
==========================================
+ Coverage   90.27%   90.31%   +0.04%     
==========================================
  Files         993      320     -673     
  Lines       87861    29750   -58111     
==========================================
- Hits        79313    26869   -52444     
+ Misses       8548     2881    -5667     

Files	Coverage Δ
src/sagemaker/base_predictor.py	90.90% <100.00%> (ø)
src/sagemaker/chainer/estimator.py	100.00% <ø> (ø)
src/sagemaker/config/config_schema.py	100.00% <100.00%> (ø)
src/sagemaker/djl_inference/model.py	91.11% <100.00%> (ø)
src/sagemaker/feature_store/feature_group.py	78.82% <ø> (ø)
...emaker/feature_store/feature_processor/__init__.py	100.00% <100.00%> (ø)
...eature_store/feature_processor/_config_uploader.py	97.43% <100.00%> (ø)
...aker/feature_store/feature_processor/_constants.py	100.00% <100.00%> (ø)
...er/feature_store/feature_processor/_data_source.py	100.00% <100.00%> (ø)
...agemaker/feature_store/feature_processor/_enums.py	100.00% <100.00%> (ø)
... and 57 more

... and 1246 files with indirect coverage changes

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