test : Update t.Fatalf calls to resolve stricter Go 1.24 validation

After bumping go version, I started seeing this error in tests:
```
Error: test/v200/utils/common/test_utils.go:371:12: non-constant format string in call to (*testing.common).Fatalf
Error: test/v200/utils/api/test_utils.go:186:13: non-constant format string in call to (*testing.common).Fatalf
```
It seems after Go 1.24, vet is flagging this case as invalid usage.

Signed-off-by: Rohan Kumar <rohaan@redhat.com>

Author: rohanKanojia

test/v200/utils/api/test_utils.go

@@ -183,7 +183,8 @@ func RunTest(testContent commonUtils.TestContent, t *testing.T) {
 
 		testDevfile, err := commonUtils.GetDevfile(testContent.FileName, nil, validator)
 		if err != nil {
-			t.Fatalf(commonUtils.LogMessage(fmt.Sprintf("Error creating devfile : %v", err)))
+			logMsg := commonUtils.LogMessage(fmt.Sprintf("Error creating devfile: %v", err))
+			t.Fatalf("%s", logMsg)
 		}
 
 		testDevfile.RunTest(testContent, t)

test/v200/utils/common/test_utils.go

@@ -368,7 +368,8 @@ func (testDevfile *TestDevfile) RunTest(testContent TestContent, t *testing.T) {
 
 	err := testDevfile.Validator.WriteAndValidate(testDevfile)
 	if err != nil {
-		t.Fatalf(LogErrorMessage(fmt.Sprintf("ERROR verifying devfile :  %s : %v", testContent.FileName, err)))
+		logMsg := LogErrorMessage(fmt.Sprintf("ERROR verifying devfile: %s : %v", testContent.FileName, err))
+		t.Fatalf("%s", logMsg)
 	}
 
 }