Use typescript for webpack config (#32507)

* Move declaration.d.ts to @types

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Load customisations.json without `require`

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Remove webpack rule from when we were consuming shared-components ts vs js

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Avoid hardcoding paths to modules in webpack config

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Convert webpack config to typescript

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Stub js webpack/postcss plugins

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Patch broken rollup types until https://github.com/getsentry/sentry-javascript-bundler-plugins/pull/870 is released

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Install @types/postcss-import

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix fdir relying on @types/picomatch

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update pnpm-lock.yaml

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

package.json

@@ -181,6 +181,7 @@
         "@types/modernizr": "^3.5.3",
         "@types/node": "22",
         "@types/pako": "^2.0.0",
+        "@types/postcss-import": "^14.0.3",
         "@types/qrcode": "^1.3.5",
         "@types/react": "catalog:",
         "@types/react-beautiful-dnd": "^13.0.0",
@@ -284,7 +285,8 @@
             "@types/mdx": "patches/@types__mdx.patch",
             "await-lock": "patches/await-lock.patch",
             "jest-fixed-jsdom": "patches/jest-fixed-jsdom.patch",
-            "jsdom": "patches/jsdom.patch"
+            "jsdom": "patches/jsdom.patch",
+            "rollup": "patches/rollup.patch"
         },
         "peerDependencyRules": {
             "allowedVersions": {