fix(shim): Restore original path for JAR cmd

[niheaven]

Description

Use pushd and popd to restore cmd path

Motivation and Context

• Closes [Bug] .jar shims change the working directory when running from cmd #6026

• Relates to fix(shim): Run JAR file from app's root directory #5872

How Has This Been Tested?

Checklist:

• I have read the Contributing Guide.
• I have ensured that I am targeting the develop branch.
• I have updated the documentation accordingly.
• I have updated the tests accordingly.
• I have added an entry in the CHANGELOG.

[davidpatel0]

This does not resolve the issue, cd shouldn't be used at all. Another problem with the current state (that this PR doesn't fix) is that using relative paths with .jar shims is broken (as they are being resolved from scoop\apps\X directory and not from the real working directory.
I will add this problem to the original issue.

[niheaven]

Yes, there are some drawbacks to this fix and using pushd/popd, but the working directory is necessary for some jar applications.

Perhaps there is a better solution, but for now, use this as a temporary bug fix.