TaggedServiceCollectorCompilerPass -> tagged_iterator

[mamazu]

Q	A
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	yes
Fixed tickets	refs #7402
Related issues/PRs	-
License	MIT
Documentation PR	-

What's in this PR?

Replacing the Sulu implementation of tagged iterators with the Symfony one.

Why?

We don't need to reinvent the wheel.

Example usage

Before you had to have this in the bundle configuration:

         $container->addCompilerPass(
            new TaggedServiceCollectorCompilerPass(
                'sulu_markup.link_tag.provider_pool',
                'sulu.link.provider',
                0,
                'alias'
            )
        );

Now Sulu uses this:

<service id="sulu_markup.link_tag.provider_pool" class="..." />
    <argument type="tagged_iterator" tag="sulu.link.provider" indexed-by="alias" />
</service>

To Do

• Add breaking changes to UPGRADE.md