Unify a prepack command for packages

[takameyer]

What, How & Why?

Packages were using the bundle script for preparing for release. Sometimes it requires more than bundling to prepare a package. This unifies everything under prepack.

☑️ ToDos

• 📝 Changelog entry
• 📝 Compatibility label is updated or copied from previous entry
• 📝 Update COMPATIBILITY.md
• 🚦 Tests
• 📦 Updated internal package version in consuming package.jsons (if updating internal packages)
• 📱 Check the React Native/other sample apps work if necessary
• 💥 Breaking label has been applied or is not necessary

[takameyer]

Putting this in draft, just want this here for later discussion

[kraenhansen]

An alternative is to add another prepack script which declares a dependency on bundle but that shouldn't happen for the realm package as we bundle this in a separate job than we package (we could of course also revisit that decision).

[takameyer]

Leaving as is for now.