Pipeline-Execution Unit Tests

[ryansteakley]

Issue #, if available:

Description of changes:
Adds unit-tests for pipeline-execution resource
Also moves pipeline-execution to bottom of file in generator.yaml
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ryansteakley]

/test sagemaker-unit-test

[ryansteakley]

/test sagemaker-unit-test

[ananth102]

/approve assuming there isnt a way to test the adopted resource code

[ryansteakley]

/approve assuming there isnt a way to test the adopted resource code

Don't know of a way to do that off top of my head. Will be something good to not down.

[ryansteakley]

/lgtm

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/lgtm

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[ack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ananth102, ryansteakley

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