Remove prebuild from the generated package.json files

[sadasant]

We recently realized that neither rush build nor rush rebuild call to prebuild. For this reason, we’ve opted for removing prebuild from the package.json files on the JS SDK, and now we run npm run clean && at the beginning of the build script.

Please help us make this change happen in the code generator, so that newly generated packages can take this change as well!

More information in the related JS SDK issue: Azure/azure-sdk-for-js#17125

[sadasant]

Important: Do not add npm run clean && to the build script. See: Azure/azure-sdk-for-js#17540

[sadasant]

wait, we are still discussing whether to remove “clean” from the build script

[sadasant]

Ok, after chatting with @mikeharder and @xirzec we’ve decided to keep npm run clean && inside of the build step. Thank you for working on this, @JonathanCrd