Cleaning up parts of android-pr.yml

[rasaha91]

Please select one of the following

• I am removing an existing difference between facebook/react-native and microsoft/react-native-macos 👍
• I am cherry-picking a change from Facebook's react-native into microsoft/react-native-macos 👍
• I am making a fix / change for the macOS implementation of react-native
• I am making a change required for Microsoft usage of react-native

Summary

Trying to execute the PR steps locally (via an automatically generated script) can result in errors when invoking the generated script multiple times. This PR attempts to fix that, and also perform some additional clean up like giving a display name to a step, generating RNTesterApp.android.bundle to the expected location, and use Unix style paths instead of windows paths

Changelog

[Android] [Fixed] - Cleaning up Android PR to allow for repeated executions without error.

Test Plan

Running the PR pipeline and executing locally.

[pull-bot]

	Warnings
⚠️	❔ Base Branch - The base branch for this PR is something other than main. Are you sure you want to merge these changes into a stable release? If you are interested in backporting updates to an older release, the suggested approach is to land those changes on main first and then cherry-pick the commits into the branch for that release. The Releases Guide has more information.

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