fix(angular-server): publish only the dist directory to avoid import errors

[liamdebeasi]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: resolves #24605

Similar to the Angular package, the Angular Server package expects only the dist directory to be published at the root, otherwise files will fail to load.

Additionally, with the Angular 12 build (3451a34) we now pass in tsconfig.json to ng-packagr. The tsconfig.json tells the compiler to build for Common JS, instead of ES2015 (what the @ionic/angular package currently does). This CJS instruction has been around for a while, but up until that commit we never passed tsconfig to ng-packagr

What is the new behavior?

• Updated the package.json config to only publish dist as the root in @ionic/angular-server.
• @ionic/angular-server is now build for es2015, just like @ionic/angular

Does this introduce a breaking change?

• Yes
• No

Other information