Run misc test shard when examples/api/** change (#129433)

Fixes https://github.com/flutter/flutter/issues/129390

Found in https://github.com/flutter/flutter/pull/129381, changing sample code in `examples/api` did not trigger the misc test shard that executes the tests for `examples/api`.

.ci.yaml

@@ -605,6 +605,7 @@ targets:
         ["framework", "hostonly", "shard", "linux"]
     runIf:
       - dev/**
+      - examples/api/**
       - packages/flutter/**
       - packages/flutter_driver/**
       - packages/integration_test/**
@@ -2588,6 +2589,7 @@ targets:
         ["framework", "hostonly", "shard", "linux"]
     runIf:
       - dev/**
+      - examples/api/**
       - packages/flutter/**
       - packages/flutter_driver/**
       - packages/integration_test/**
@@ -2866,6 +2868,7 @@ targets:
         ["framework", "hostonly", "shard", "mac"]
     runIf:
       - dev/**
+      - examples/api/**
       - packages/flutter/**
       - packages/flutter_driver/**
       - packages/integration_test/**
@@ -4212,6 +4215,7 @@ targets:
         ["framework", "hostonly", "shard", "windows"]
     runIf:
       - dev/**
+      - examples/api/**
       - packages/flutter/**
       - packages/flutter_driver/**
       - packages/integration_test/**