Docs: add legends shared content (#86814)
* Updated shared file name and added missing options
* Added legend options 1 shared file to relevant visualizations
* Updated shared file name and corrected options
* Added legend options 2 shared file to relevant visualizations
* Updated legend content for heatmap and pie chart
* Added where shared legend files are used in each file
* Moved intro text out of viz pages into legend options shared files
* Added reasoning to front matter of shared files
* Added reasoning to front matter of shared files
* Fixed version interpolation and added cloud links
* Updated links in shared files
(cherry picked from commit dad3069594)
Co-authored-by: Isabel Matwawana <76437239+imatwawana@users.noreply.github.com>
grafana-delivery-bot[bot]
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