build: update packages for npm publishing

[brandonroberts]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Closes #

What is the new behavior?

No longer relies on the angular.json to determine which packages are published

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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[timdeschryver]

LGTM.
Do we need to merge this collection of publishable packages with the packages collection that are created based on the modules directory?
This to have a single source of truth.

platform/build/config.ts

Line 13 in 8702590

export const packages: PackageDescription[] = fs