[per-OS Packages] Suggest --platform/--exclude-platform upon error with installing package that is uninstallable on user's platform

[savil]

Summary

Changes the error message to suggest using --platform/--exclude-platform with devbox add.

I wish we had a way to recommend the platforms that are supported for the exact package being installed, but we don't.

The heavy lifting for this was done in #1279. Thanks @mikeland73!

How was it tested?

> devbox add glibcLocales

Installing package: glibcLocales.


Error: package glibcLocales cannot be installed on your platform x86_64-darwin. Consider using `--platform` or `--exclude-platform` with `devbox add` to install on a supported platform. Other available platforms are: aarch64-darwin, aarch64-linux, i686-linux, x86_64-linux, armv7l-linux.

[savil]

Current dependencies on/for this PR:

• main
  • PR [Packages] Introduce the concept of Installable packages #1357
    • PR devbox.findPackagesByName should be constructed from Config packages #1360
      • PR [per-OS Packages] Add platforms and excluded_platforms functionality #1358
        • PR [per-OS Packages] in devbox add, allow multiple --platform/--exclude-platform flag values #1363
          • PR [per-OS Packages] Suggest --platform/--exclude-platform upon error with installing package that is uninstallable on user's platform #1364 👈
            • PR [per-OS Packages] fix devbox update for unversioned packages with platform/excluded-platform #1370

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[savil]

Gonna make two fixes:

1. Simplify the error message
2. Ensure we can do devbox add <package> --exclude-platform <platform> even if the package exists in the devbox.json