feat: support for solid/solidjs templates and migrations for 8.7

[NathanWalker]

PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• You have signed the CLA.
• All existing tests are passing: https://github.com/NativeScript/nativescript-cli/blob/master/CONTRIBUTING.md#contribute-to-the-code-base
• Tests for the changes are included.

What is the current behavior?

ns migrate would not update to {N} 8.7 with latest flavor updates.

What is the new behavior?

ns migrate will now update to {N} 8.7 with latest flavor updates.

Fixes/Implements/Closes #[Issue Number].