[DevTools] remove backend dependency from the global hook (#26563)

## Summary

- #26234 is reverted and replaced with a better approach 
- introduce a new global devtools variable to decouple the global hook's
dependency on backend/console.js, and add it to react-devtools-inline
and react-devtools-standalone

With this PR, I want to introduce a new principle to hook.js: we should
always be alert when editing this file and avoid importing from other
files.
In the past, we try to inline a lot of the implementation because we use
`.toString()` to inject this function from the extension (we still have
some old comments left). Although it is no longer inlined that way, it
has became now more important to keep it clean as it is a de facto
global API people are using (9.9K files contains it on Github search as
of today).


**File size change for extension:**
Before:
379K installHook.js

After:
 21K installHook.js
363K renderer.js