Change assertLint helper to run via the pipeline only.

Standalone lint visitors don't check for swift-format-ignore markers,
so any test cases that use those markers will return different
results between standalone vs full pipeline. Since the app uses
the pipeline only, there is no value in running the rule standalone.

Tests/SwiftFormatTests/Rules/DontRepeatTypeInStaticPropertiesTests.swift

@@ -75,4 +75,22 @@ final class DontRepeatTypeInStaticPropertiesTests: LintOrFormatRuleTestCase {
       ]
     )
   }
+
+
+  func testIgnoreSingleDecl() {
+    assertLint(
+      DontRepeatTypeInStaticProperties.self,
+        """
+        struct Foo {
+          // swift-format-ignore: DontRepeatTypeInStaticProperties
+          static let defaultFoo: Int
+          static let 1️⃣alternateFoo: Int
+        }
+        """,
+      findings: [
+        FindingSpec("1️⃣", message: "remove the suffix 'Foo' from the name of the variable 'alternateFoo'"),
+      ]
+    )
+  }
+
 }

Tests/SwiftFormatTests/Rules/LintOrFormatRuleTestCase.swift

@@ -42,16 +42,6 @@ class LintOrFormatRuleTestCase: DiagnosingTestCase {
       configuration: configuration,
       selection: .infinite,
       findingConsumer: { emittedFindings.append($0) })
-    let linter = type.init(context: context)
-    linter.walk(sourceFileSyntax)
-
-    assertFindings(
-      expected: findings,
-      markerLocations: markedText.markers,
-      emittedFindings: emittedFindings,
-      context: context,
-      file: file,
-      line: line)
 
     var emittedPipelineFindings = [Finding]()
     // Disable default rules, so only select rule runs in pipeline
@@ -66,7 +56,7 @@ class LintOrFormatRuleTestCase: DiagnosingTestCase {
       operatorTable: OperatorTable.standardOperators,
       assumingFileURL: URL(string: file.description)!)
 
-    // Check that pipeline produces the same findings as the isolated linter rule
+    // Check that pipeline produces the expected findings
     assertFindings(
       expected: findings,
       markerLocations: markedText.markers,