This PR was submitted for the 4.1 branch but it was merged into the 4.2 branch instead (closes #30417).

Discussion
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Autoconfig: don't automatically tag decorators

| Q             | A
| ------------- | ---
| Branch?       | 4.1
| Bug fix?      | yes
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | #30391   <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | n/a

Commits
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05ecf82 Autoconfig: don't automatically tag decorators

…ecorators (LANGERGabrielle)

This PR was merged into the 5.4 branch.

Discussion
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[DependencyInjection] Fix AsEventListener not working on decorators

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT
| Doc PR        |

When using the `AsEventListener` on a decorator, it is ignored instead of registering the decorator as an event listener. This is because autoconfigured tags are not applied to decorators since #30417.

`EventSubscriberInterface` works as expected since #38999, when the `kernel.event_subscriber'` tag was added to a list of "behavior describing tags" which can be autoconfigured onto decorators.

This PR adds `kernel.event_listener` to this default list of tags, making `AsEventListener` work as expected on decorators.

Commits
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5fbb217 Added `kernel.event_listener` to the default list of behavior describing tags, fixing AsEventListener attribute not working on decorators.

…l decorator (HypeMC)

This PR was merged into the 5.4 branch.

Discussion
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[DependencyInjection] Don't ignore attributes on the actual decorator

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #49931
| License       | MIT
| Doc PR        | -

An attempt to fix #49931 without reintroducing the problem reported in #30391 and fixed by #30417. The idea here is that if the attribute is declared on the decorator itself, it shouldn't be ignored as it was explicitly added.

Commits
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fdd2ec2 [DependencyInjection] Don't ignore attributes on the actual decorator