test: remove some unused perf tests

damusTests/NIP19Tests.swift

@@ -52,11 +52,4 @@ final class NIP19Tests: XCTestCase {
         XCTAssertEqual(res[2], .text("?"))
     }
     
-    func testPerformanceExample() throws {
-        // This is an example of a performance test case.
-        self.measure {
-            // Put the code you want to measure the time of here.
-        }
-    }
-
 }

damusTests/NostrScriptTests.swift

@@ -105,11 +105,4 @@ final class NostrScriptTests: XCTestCase {
         self.wait(for: [resume_expected], timeout: 10.0)
     }
 
-    func testPerformanceExample() throws {
-        // This is an example of a performance test case.
-        self.measure {
-            // Put the code you want to measure the time of here.
-        }
-    }
-
 }