[web] enable always_specify_types for web_ui (#53226)

`always_specify_types: false` and `avoid_dynamic_calls: false` is a dangerous combination. Let's clean up `avoid_dynamic_calls` before disabling `always_specify_types`.

Author: yjbanov

lib/web_ui/analysis_options.yaml

@@ -8,6 +8,7 @@ include: ../../analysis_options.yaml
 
 linter:
   rules:
+    always_specify_types: true # avoid_dynamic_calls needs to be cleaned up before we can start relying on type inference
     avoid_dynamic_calls: false
     avoid_print: false
     avoid_setters_without_getters: false