Deprecate DispatchInfo.components in favor of target

[Marenz]

Summary

• Rename DispatchInfo's components property to target in a backwards compatible way with deprecation warning
• Update release notes to document the deprecation

This change maintains backward compatibility by keeping the components property as a deprecated alias for target.

[Copilot]

Pull Request Overview

This PR deprecates the components property in DispatchInfo in favor of a new target property while maintaining backward compatibility through a deprecated property alias.

• Replaces direct components field with target field and adds deprecated components property
• Updates all references from components to target in tests and implementation code
• Documents the deprecation in release notes

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/frequenz/dispatch/_actor_dispatcher.py	Adds deprecated components property, introduces target field, and updates constructor call
tests/test_managing_actor.py	Updates test assertions to use target instead of components
RELEASE_NOTES.md	Documents the deprecation of components property

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[llucax]

Nitpick. I've been using X is deprecated, use Y instead, in case you want to follow the same pattern for consistency. I was also considering adding versioning info to deprecations, like:

    @property
    @deprecated("Use 'target' instead of 'components'.")
llucaxAdd a comment on line R42
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Nitpick. I've been using `X is deprecated, use Y instead`, in case you want to follow the same pattern for consistency. I was also considering adding versioning info to deprecations, like:

```py
    def components(self) -> TargetComponents:
        """Get the target components.

        Deprecation: Deprecated in vX.Y.Z
            Use [`target`][frequenz....target] instead.
        """
        return self.target