Update icons for sidebar

[somebody1234]

Pull Request Description

• Use icons more closely matching the current design in the Asset Panel (right sidebar).

Important Notes

None

Screenshots

Before:

After:

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• [x] The documentation has been updated, if necessary.
• [x] Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• [x] All code follows the Scala, Java, TypeScript, and Rust style guides. In case you are using a language not listed above, follow the Rust style guide.
• [x] Unit tests have been written where possible.
• [x] ~~If meaningful changes were made to logic or tests affecting Enso Cloud integration in the libraries, or the Snowflake database integration, a run of the Extra Tests has been scheduled.~~
  • If applicable, it is suggested to paste a link to a successful run of the Extra Tests.

[MrFlashAccount]

Is there an issue for that?

[somebody1234]

no, this is optional to merge in - i just needed to edit the icons anyway because i was working on async execution, so i figured it doesn't hurt to extract this out to a PR to gather feedback or something

[MrFlashAccount]

Okay, I personally prefer the ones we have. Feel free to bring this discussion up during the daily meeting, for example.