[0.73] Update app template's metro config with latest upstream changes #12280
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This PR backports #12279 to 0.73.
Description
This PR applies the changes we need to an app's metro config on top of a more recent snap of the default metro config for an RN app.
Type of Change
Why
To fix new apps not loading because of a badly configured bundle.
Resolves: #12268
What
Coped the current RN template metro.config.js and applied our changes.
Screenshots
N/A
Testing
Verified a new app loads correctly
Changelog
Should this change be included in the release notes: yes
Update app template's metro config with latest upstream changes
Microsoft Reviewers: Open in CodeFlow