adding ember-cli to deps will speed things up

There are certain project generation things we do which don't depend on a version of ember, for example running an addon's default blueprint in isolation. Instead of using npx all the time, we could add ember-cli to deps to speed up things. This should really help the test suite too.

未指定文件或测试。首先定位项目生成入口和所有 npx 调用，然后检查测试套件如何隔离测试 addon 默认 blueprint。完成的标准是：在需要的地方可从依赖中使用 ember-cli，这些情况下不再需要 npx，并且测试套件仍能通过，同时获得预期的速度提升。

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