chore(smoke-tests): skip uninstalling when running on GHA

[kraenhansen]

Description

Since the GHA runners are pristine environments and we run only one package and test per job, the uninstalling and cleanup serve no purpose and is just adding noise.

Checklist

• New tests and/or benchmarks are included
• Documentation is changed or added
• I have signed the MongoDB Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)

Motivation and Context

• Bugfix
• New feature
• Dependency update
• Misc

Open Questions

Dependents

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)