Overview

Refactors most 8 digit hex codes in the dark, dark grey, and light themes to be 6 digits (no opacity)
- Two properties keep their opacity to fit with VS Code theme conventions
Closes #293 (closed)

How to test

Preview new themes: Clone this project and launch the Web IDE locally
View current themes: Open any live GitLab project using the Web IDE
To change themes: File > Preferences > Theme > Color Theme > Pick Theme
- Theme options: GitLab Light, GitLab Dark, GitLab Dark Grey
Can quickly check for 8 digit hex codes using a regex search in each theme file: #[A-Fa-f0-9]{8}\b
- Note: Intentionally kept 2 properties using the 8 digit hex code since they interact with multiple backgrounds

8 digit hex codes were overlaid on their respective background elements and converted to matching 6 digit color codes.
Exception for colors.statusBarItem.hoverBackground and colors.sideBar.dropBackground which should remain as 8 digits. They keep opacity because they interact with multiple backgrounds.
Specific color swap details can be found in Figma

Updated colors.checkbox.border, colors.dropdown.border, colors.input.border to better match background in the light theme.

Converting opacity values requires finding the correct background when color matching. This process was a mix of deciphering theme property names along with an eye test in the theme previewer so it's possible that some edge case color combos were overlooked.

VS Code deprecated some properties. Their API reference is a bit vague if the linter recommendations match behavior 1:1 so I'll research and address these in a future MR.
- e.g. IndentGuide.background, IndentGuide.activeBackground, and fontStyle.