Fixes for Windows compatibility

[evanweible-wf]

There are several paths that we're using in our executable and in the run script that we generate and we need to construct them with the appropriate APIs from package:path to ensure they work when running on Windows. This PR does that.

[aviary-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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Questions or Comments? Reach out on Slack: #support-infosec.

[autobot-wk]

Skynet test results failed initially for this build but were approved by evan.weible
https://wf-skynet-hrd.appspot.com/apps/test/smithy/3860935/1
Approval message: Known failures on alpha and beta.

[autobot-wf]

Skynet test results failed initially for this build but were approved by evan.weible
https://wf-skynet-hrd.appspot.com/apps/test/smithy/3863889/1
Approval message: Known failures on beta and alpha.

[evanweible-wf]

QA +1

• Had a Windows user manually verify that this fixes the issue with the generated run script.
• CI passes on stable, which now includes running the entire test suite on Windows.

@Workiva/release-management-p

[rmconsole-wf]

+1 from RM