docs: update images stanza to new items format

[Prucek]

Summary

• Update all images: YAML examples from plain array format to the new items: key format
• Document new filter fields available on the images stanza: run_if_changed, skip_if_only_changed, pipeline_run_if_changed, pipeline_skip_if_only_changed, and build_if_affected

Companion PRs:

• feat(prowgen): propagate run_if_changed/skip_if_only_changed for images jobs ci-tools#5009
• chore: migrate images stanza to use items key and propagate filters release#76548

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Test name	Commit	Details	Required	Rerun command
ci/prow/links	3e6f0f3	link	true	/test links

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