fix: xgboost, sklearn network isolation for jumpstart

[evakravi]

Issue #, if available:
V542026104

Description of changes:
This PR fixes the inference host environment variable for SAGEMAKER_SUBMIT_DIRECTORY, so that it gets the proper value when the script/model artifacts get repackaged.

Testing done:

Merge Checklist

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General

• I have read the CONTRIBUTING doc
• I certify that the changes I am introducing will be backword compatible, and I have discussed concerns about this, if any, with the Python SDK team
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• I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added unit and/or integration tests as appropriate to ensure backward compatibility of the changes
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• I have used unique_name_from_base to create resource names in integ tests (if appropriate)

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[codecov-commenter]

Codecov Report

Merging #3060 (37ec4de) into master (10f1e24) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3060      +/-   ##
==========================================
- Coverage   89.45%   89.38%   -0.08%     
==========================================
  Files        1033      197     -836     
  Lines       84216    16668   -67548     
==========================================
- Hits        75338    14898   -60440     
+ Misses       8878     1770    -7108     

Impacted Files	Coverage Δ
src/sagemaker/model.py	92.16% <100.00%> (ø)
...python3.9/site-packages/sagemaker/sparkml/model.py
...hon3.8/site-packages/sagemaker/pytorch/defaults.py
...agemaker/cli/compatibility/v2/modifiers/parsing.py
...ite-packages/sagemaker/debugger/profiler_config.py
...on3.7/site-packages/sagemaker/apiutils/__init__.py
.../lib/python3.9/site-packages/sagemaker/pipeline.py
...on3.9/site-packages/sagemaker/pytorch/estimator.py
...site-packages/sagemaker/amazon/amazon_estimator.py
...lib/python3.8/site-packages/sagemaker/vpc_utils.py
... and 827 more

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 37ec4de
• Result: SUCCEEDED
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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: 37ec4de
• 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: 37ec4de
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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