Reduce log severity to warning for unfound ESLint reports (#4622)

sonar-plugin/sonar-javascript-plugin/src/main/java/org/sonar/plugins/javascript/external/EslintReportSensor.java

@@ -78,7 +78,7 @@ void importReport(File report, SensorContext context) {
         }
       }
     } catch (IOException | JsonSyntaxException e) {
-      LOG.error(FILE_EXCEPTION_MESSAGE, e);
+      LOG.warn(FILE_EXCEPTION_MESSAGE, e);
     }
   }
 

sonar-plugin/sonar-javascript-plugin/src/test/java/org/sonar/plugins/javascript/external/EslintReportSensorTest.java

@@ -116,7 +116,7 @@ void should_log_invalid_report() throws Exception {
     Collection<ExternalIssue> externalIssues = context.allExternalIssues();
     assertThat(externalIssues).hasSize(0);
 
-    assertThat(logTester.logs(LoggerLevel.ERROR))
+    assertThat(logTester.logs(LoggerLevel.WARN))
       .contains("No issues information will be saved as the report file can't be read.");
   }
 
@@ -128,7 +128,7 @@ void should_log_not_existing_report() throws Exception {
     Collection<ExternalIssue> externalIssues = context.allExternalIssues();
     assertThat(externalIssues).hasSize(0);
 
-    assertThat(logTester.logs(LoggerLevel.ERROR))
+    assertThat(logTester.logs(LoggerLevel.WARN))
       .contains("No issues information will be saved as the report file can't be read.");
   }