bug #18246 [DependencyInjection] fix ambiguous services schema (backbone87)
bug #18246 [DependencyInjection] fix ambiguous services schema (backbone87)

This PR was merged into the 2.3 branch.

Discussion
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[DependencyInjection] fix ambiguous services schema

| Q             | A
| ------------- | ---
| Branch?       | 2.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   |
| Fixed tickets | #17460 #2122
| License       | MIT

Commits
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9828f23 bug #17460 [DI] fix ambiguous services schema

symfony/DependencyInjection,symfony/dependency-injection