Upgrade to TypeScript 7 (#34208)

* Upgrade to TypeScript 7

for massive tsc speed gains

Those on WebStorm will want to upgrade to EAP to reap the benefits of the new TSGo compiler

Some things (module-api & shared-components) which utilise unplugin-dts (and api-extractor) need to hold a copy of ts6 for its conventional lib format and API. TS7 ships with no API until TS7.1.

Other things which use eslint also need ts6 for typescript-eslint.

Some type changes were necessary as TS7 caught some issues.

* Add knip exception

* Fix bad merge

knip.ts

@@ -113,6 +113,8 @@ export default {
     ignoreDependencies: [
         // Used by multiple packages, raises a false positive for some reason
         "events",
+        // Used as a workaround for api-extractor not supporting typescript 7.0
+        "@typescript/old",
     ],
     ignoreExportsUsedInFile: true,
     ignoreBinaries: [