Fix detection of previous PR annotation comments

MarkdownFormatterFactory uses System.lineSeparator() as the end-of-line
character for annotation comments.

GraphqlGithubClient.postSummaryComment(), however, uses hardcoded \r\n
as end-of-line character, so it isn't able to match legitimate comments
if SonarQube is not running on Windows.

This change updates GraphqlGithubClient to also use system end-of-line
char.

src/main/java/com/github/mc1arke/sonarqube/plugin/almclient/github/v4/GraphqlGithubClient.java

@@ -133,11 +133,12 @@ private void postSummaryComment(String graphqlUrl, Map<String, String> headers,
 
         GetRepository.PullRequest pullRequest = getPullRequest(graphqlUrl, headers, pullRequestKey);
         String pullRequestId = pullRequest.getId();
+        String projectCommentMarker = String.format("**Project ID:** %s%n", projectId);
 
         getComments(pullRequest, graphqlUrl, headers, pullRequestKey).stream()
             .filter(c -> "Bot".equalsIgnoreCase(c.getAuthor().getType()) && login.equalsIgnoreCase(c.getAuthor().getLogin()))
             .filter(c -> !c.isMinimized())
-            .filter(c -> c.getBody().contains(String.format("**Project ID:** %s\r\n", projectId)))
+            .filter(c -> c.getBody().contains(projectCommentMarker))
             .map(Comments.CommentNode::getId)
             .forEach(commentId -> this.minimizeComment(graphqlUrl, headers, commentId));
 

src/test/java/com/github/mc1arke/sonarqube/plugin/almclient/github/v4/GraphqlGithubClientTest.java

@@ -148,6 +148,7 @@ void verifyCheckRunSubmitsCorrectAnnotations() throws IOException {
         ArgumentCaptor<GraphQLRequestEntity> getViewer = ArgumentCaptor.forClass(GraphQLRequestEntity.class);
         when(graphQLTemplate.query(getViewer.capture(), eq(Viewer.class))).thenReturn(viewerResponseEntity);
 
+        String bodyString = objectMapper.writeValueAsString("**Project ID:** project-key-test" + System.lineSeparator());
         GraphQLResponseEntity<GetRepository> getPullRequestResponseEntity =
             objectMapper.readValue("{" +
                 "\"response\": " +
@@ -159,7 +160,7 @@ void verifyCheckRunSubmitsCorrectAnnotations() throws IOException {
                 "          {" +
                 "            \"id\": \"MDEyOklzc3VlQ29tbWVudDE1MDE3\"," +
                 "            \"isMinimized\": false," +
-                "            \"body\": \"**Project ID:** project-key-test\\r\\n\"," +
+                "            \"body\": " + bodyString + "," +
                 "            \"author\": {" +
                 "              \"__typename\": \"Bot\"," +
                 "              \"login\": \"test-sonar\"" +