Add Icon Path Parameter

[The-Jonsey]

Add Icon Path Parameter to display image from html report as icon on jenkins sidebar

Testing done

Created pipeline on self-hosted jenkins instance with parameter set, checked both project base URL as well as individual job pages, and updated relevant tests.

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[ugrave]

Does it also support using icons defined by other plugins?
Like the bade plugin supports:
https://plugins.jenkins.io/badge/#plugin-content-icons

[jonesbusy]

I'm also interested by adding custom symbol

Looking at the code custom symbol doesn't seen supported because it assume it's always a path

I would like to set something like symbol-playwright-icon-solid plugin-oss-symbols-api for a custom icon for playwright html report