Fix otel-collector-windows packaging script

[acrmp]

Description

• PR Build otel-collector distribution #360 changed the otel-collector-windows packaging script to use Windows-style backslashes as path delimiters
• This isn't actually desirable everywhere because the first line of the packaging script exists to prevent an error when exporting a BOSH release and attempting to compile this Windows package on a Linux instance

Fixes:

.exiter.ps1: No such file or directory

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Testing performed?

• Unit tests
• Integration tests
• Acceptance tests

Checklist:

• This PR is being made against the main branch, or relevant version branch
• I have made corresponding changes to the documentation
• I have added testing for my changes

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