Upgrade to Babel 8, Vite 8, and babel-plugin-ember-template-compilation 4

Bump @babel/core, @babel/eslint-parser, @babel/plugin-transform-runtime,
and @babel/runtime to ^8.x. Remove useESModules and regenerator options
from @babel/plugin-transform-runtime config (both removed in Babel 8).
Switch @babel/eslint-parser import from the removed /experimental-worker
entry point to the main entry point.

Bump vite to ^8.0.0 (now using Rolldown/Oxc instead of esbuild/Rollup).
Bump @rollup/plugin-babel to ^7.1.0 and
babel-plugin-ember-template-compilation to ^4.0.0.

Patch ember-concurrency@5.2.0 to remove the api.assertVersion(7) call
that is incompatible with Babel 8 (ember-concurrency has not yet
released a Babel 8-compatible version).

babel.config.mjs

@@ -37,8 +37,6 @@ export default {
       '@babel/plugin-transform-runtime',
       {
         absoluteRuntime: dirname(fileURLToPath(import.meta.url)),
-        useESModules: true,
-        regenerator: false,
       },
     ],
     ...macros.babelMacros,