CLI: Upgrade automigrations to use new safe helpers

[yannbf]

• This makes the code safer as it does not evaluate properties, just looks for string literals that identify that property

Issue: N/A

What I did

Telescoping #20691 to replace getFieldValue calls with getNameFromPath where applicable.

How to test

1. build the libraries
2. run the sb automigrate command where new-frameworks, sveltekit-framework, missing-babelrc, mainjsFramework could be applicable (could be multiple runs, no need for all at the same time) - I did test all of them
3. The automigrations should work fine
4. The automigrations should not fail if there are weird things like (where it would fail without these changes where applicable):

{
  framework: {
    name: '@storybook/react',
    options: { foo: require('bar') }
}

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• If this PR should be tested against many or all sandboxes,
  make sure to add the ci:merged or ci:daily GH label to it.
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "documentation", "maintenance", "dependencies", "other"]

[shilman]

Looks great! Did not test