fix(deps): update embroider monorepo (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@embroider/addon-dev (source)	^7.1.3 -> ^8.0.1
@embroider/compat (source)	^3.8.5 -> ^4.1.0
@embroider/core (source)	^3.5.5 -> ^4.1.0
@embroider/router (source)	^2.1.8 -> ^3.0.1

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Release Notes

embroider-build/embroider (@​embroider/router)

v3.0.0

• BREAKING: @embroider/addon-template/template-transform-plugin is removed
  because babel-plugin-ember-template-compilation >= 2.0.0 now directly supports
  source-to-source transformation.

  This plugin was used to run any custom AST transformations on your templates before publishing. To replace it:

  1. Add babel-plugin-ember-template-compilation@^2.0.0 as a devDependency.

  2. Make sure you also have a devDependency on ember-source, so we have a template compiler.

  3. Update the babel config like:

     plugins: [
     -   [
     -     '@​embroider/addon-dev/template-transform-plugin',
     -     {
     -       astTransforms: [
     -         ...yourPluginsHere
     -       ]
     -     }
     -   ],
     +   [
     +     'babel-plugin-ember-template-compilation',
     +     {
     +       compilerPath: 'ember-source/dist/ember-template-compiler',
     +       targetFormat: 'hbs',
     +       transforms: [
     +         ...yourPluginsHere
     +        ]
     +     }
     +   ]
     ]

  See https://github.com/emberjs/babel-plugin-ember-template-compilation for the complete docs on these options.

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