Run type check for all web app packages in CI (#22578)

* Fix incorrect usage of types pacakge

* Make platform packages properly expose their type definitions

* Have Boards, Channels, and Playbooks get types from platform packages properly

* Run type check for all web app packages in CI

* Fix incorrect job name

webapp/.gitignore

@@ -2,6 +2,7 @@
 junit.xml
 node_modules
 *.tsbuildinfo
+.rollup.cache
 
 channels/dist
 playbooks/dist