feature #15685 [3.0] Various deprecation removal (nicolas-grekas)
feature #15685 [3.0] Various deprecation removal (nicolas-grekas)

This PR was merged into the 3.0-dev branch.

Discussion
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[3.0] Various deprecation removal

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

b1f3d52 [3.0] Various deprecation removal

symfony/DoctrineBridge,symfony/doctrine-bridge