chore: OPTIC-1778: Unify and prettify icons

[yyassi-heartex]

we have icons across the different libraries that make up LabelStudio. this PR unifies them to remove duplicates + allows us to standardize them. will also run by design to make sure we update icons to a more modern look

[yyassi-heartex]

/git merge

Workflow run
Successfully merged: 19 files changed, 258 insertions(+), 67 deletions(-)

[luarmr]

❤️

[nass600]

My only comment is regarding icon naming and folder organization:
I am not sure if the naming follows this figma or there are any other source
Regarding the structure with assets I see some icons in categorized folders and other that aren't. Is it following any reasoning?

[bmartel]

My only comment is regarding icon naming and folder organization: I am not sure if the naming follows this figma or there are any other source Regarding the structure with assets I see some icons in categorized folders and other that aren't. Is it following any reasoning?

@nass600
The only reasoning here is it retained the folder structure of the existing icons when moved over to the UI lib, to cut down on amounts of changes required as the focus was on unification most of all in this ticket. I think it is worth doing though, which we have follow up tickets to address. In the follow up I want to have two things be true:

1. Standardized icons (organize and name them according to figma, also drop any which should not exist/tweak etc.)
2. All icons are available in Storybook