[TwigBundle] Moved the setting of the default escaping strategy from the Twig engine to the Twig environment

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11773
| License       | MIT
| Doc PR        | n/a

The default escaping strategy was set on the Twig Engine and not the Twig Environment. That's a problem under some circumstances (like what #11773 describes), but it's also much better to set everything on the Twig  Environment directly.

What about putting it in the bridge (or even in Twig itself) as it has nothing specific to the framework ?