feat(frontend): add ability to download dashboard and chart as image (a…

…pache#9819)

* feat(frontend): add ability to export dashboard and chart as image (apache#6973)

* refactor: migrate download image as to typescript

* feature(frontend): download as image updates

add toast message if error occurs.
make generate file stem an internal method.

* refactor(frontend): move default background color to a const

* feat(frontend): wrap download image toast in translate function