fix: pass network isolation config to pipelineModel

[shreyapandit]

Issue #, if available:
https://tiny.amazon.com/1ia05f0b2

Description of changes:
We recently fixed passing network isolation while creating a model (#2553), this propagates it further to PipelineModel which also requires it.

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: d0f2645
• 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: 2fa31c2
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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