feat: add .ets、.d.ets icons and remove .ets、.d.ets from TypeScript

[Groupguanfang]

Description

Not long ago, I directly mapped the file icons of .ets and .d.ets to TypeScript (#2966). Now, I have submitted an ets.svg and ets-def.svg icons, it modified based on typescript.svg and typescript-def.svg icons, and changed their colors to the theme color of the ETS file (See: github-linguist/linguist#7593 (comment)).

This icon is composed of the three letters ETS, and I don't know if it will create a visually overly complicated effect. I have only made this modification for now, because the .ets file does not have an official file icon for material design.

In the Catppuccin Icons for VSCode repository, they have an issue that states what the file icons look like in the official IDE for developing HarmonyOS Apps (their IDE is based on IntelliJ IDEA): catppuccin/vscode-icons#570

My suggestion is that the icon for the ETS file should be directly modified from the icon of the TS file or keep to using the original TS file icons, because the icons in the official IDE do not have more reference value in this icon library.

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