test(contracts): cover matrix session binding adapters (#50369)

Merged via squash.

Prepared head SHA: 25412dbc2c
Co-authored-by: ChroniCat <220139611+ChroniCat@users.noreply.github.com>
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Reviewed-by: @gumadeiras

extensions/matrix/api.ts

@@ -1,3 +1,8 @@
 export * from "./src/setup-core.js";
 export * from "./src/setup-surface.js";
+export {
+  createMatrixThreadBindingManager,
+  getMatrixThreadBindingManager,
+  resetMatrixThreadBindingsForTests,
+} from "./src/matrix/thread-bindings.js";
 export { matrixOnboardingAdapter as matrixSetupWizard } from "./src/onboarding.js";