Add code/YAML example snippet to the Dump plugin documentation
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Issue body
### Request type
Enhancement
### What needs to get done
Please add a code/YAML example snippet to the [Dump plugin section](https://canonical-charmcraft.readthedocs-hosted.com/en/latest/common/craft-parts/reference/plugins/dump_plugin/) of the documentation, similar to what is provided for other plugins.
### Rationale
Including a concrete example helps reinforce the conceptual understanding of how to use the dump plugin effectively and maintains consistency with the documentation style of other plugins, which already include example snippets.
This would be especially valuable for onboarding users who rely on examples to understand real-world usage and configurations.
### Documentation location
https://canonical-charmcraft.readthedocs-hosted.com/en/latest/common/craft-parts/reference/plugins/dump_plugin/
### Additional information
_No response_
Evaluation history
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