Fix test type declarations in global.d.ts

[rcantin-w]

What does this change?

I don't know about you but all my *.test.ts files were working, but shown as erroring in VSCode (it didn't know what "describe" was or where it came from, for example).

This replaces the import 'jest-extended' side-effect import in api/test/global.d.ts with explicit triple-slash reference directives:

-import 'jest-extended';
+/// <reference types="jest" />
+/// <reference types="jest-extended" />

global.d.ts is a pure declaration file (ambient module augmentation). Using an import statement inside it turns it into a module, which can cause the global type augmentations from jest and jest-extended to not be picked up correctly. Triple-slash references are the correct way to pull in type declarations in an ambient .d.ts file, and also makes the dependency on jest itself explicit.

How to test

Is TS happy? Is your IDE happy? (Might have to restart it)

All tests should pass and no type errors should be reported.

Risks

None — declaration-file only change with no runtime impact.

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