(build) Update build configuration

After chatting with Josh, we have decided that the previous commit was
the wrong approach, and instead, the Pull Request feature should be
used to correctly identify which PR branches are available to build.
The previous change to the vcs branch filter has been reverted, and the
Pull Request feature, as used in the Unit Test build configuration has
been copied into the scheduled integration tests build configuration.

Author: gep13

.teamcity/settings.kts

@@ -153,12 +153,17 @@ object ChocolateySchd : BuildType({
                 +:<default>
             """.trimIndent()
             triggerBuild = always()
-            withPendingChangesOnly = false
+			withPendingChangesOnly = false
         }
-        vcs {
-          branchFilter = """
-            +:*
-          """.trimIndent()
+    }
+
+    features {
+        pullRequests {
+            provider = github {
+                authType = token {
+                    token = "%system.GitHubPAT%"
+                }
+            }
         }
     }