Test finalized icon contribution API

[aeschli]

Refs: #119101

• anyOS @Tyriar

Complexity: 3

Create Issue

---

To verify:

• create a new extension with yo code
• add https://github.com/microsoft/vscode/blob/main/extensions/theme-seti/icons/seti.woff to the extension's root
• add to contributes in package.json

	"icons": {
		"foo-climate": {
			"description": "Climate icon",
			"default": {
				"fontPath": "./seti.woff",
				"fontCharacter": "\\E014"
			}
		},
		"foo-search-light": {
			"description": "Search light icon",
			"default": {
				"fontPath": "./seti.woff",
				"fontCharacter": "\\E015"
			}
		}
	}

• create a status bar entry and use $(foo-climate)

		const item = vscode.window.createStatusBarItem();
		item.text = 'Hello $(foo-climate) $(foo-search-light) $(zap)';

Test that the icons show
Test that no enabledApiProposals is needed.

[Tyriar]

@aeschli probably not an issue but fyi:

[aeschli]

I corrected the sample, underscore is not allowed.