fix: stencil projects can build ionicons

[sean-perkins]

The collections directory is used by consuming Stencil projects to append a project built with Stencil, to the build context of the current project using Stencil. It is weird, but means that for a project using Stencil (e.g.: Ionic Framework), to be able to build another project using Stencil (e.g.: Ionicons), it needs to be able to read in the generated collections metadata. I believe this mainly applies to the dist output target.

This was recently disabled/removed in the v8 work. This is the primary reason for the build error in: ionic-team/ionic-framework#30390.

There may be other ways to solve this problem. This is the primary way that I am aware resolves it.

Verification steps:

1. Clone the fork
2. Install dependencies: npm install
3. Build the project: npm run build
4. Observe: collections are generated in dist/collection
5. Pack the built output: npm pack
6. Copy the .tgz into the core/ directory of Ionic Framework
7. Install the .tgz: npm install ./path-to-file
8. Build Ionic Framework: npm run build
9. Observe: Ionic Framework builds successfully

[brandyscarney]

Confirmed this fixes the build in Ionic, thank you! 🥂

[christian-bromann]

Thanks a lot ❤