JSONReporter considers verbosity when listing tests

* Quiet verbosity provides just the test names
* Normal verbosity adds tags
* High verbosity add the source location of the tests

Listing tests with the quiet verbosity results in about 1/4 of the
previous output, which leads to measurably faster execution of
`catch_discover_tests` when it does not need tags for labels.
(If it does need tags, the output is about 1/2 of previous).

src/catch2/reporters/catch_reporter_json.cpp

@@ -349,13 +349,15 @@ namespace Catch {
             if (!info.className.empty()) {
                 desc_writer.write( "class-name"_sr ).write( info.className );
             }
-            {
+            if ( m_verbosity >= Verbosity::Normal ) {
                 auto tag_writer = desc_writer.write( "tags"_sr ).writeArray();
                 for ( auto const& tag : info.tags ) {
                     tag_writer.write( tag.original );
                 }
             }
-            writeSourceInfo( desc_writer, info.lineInfo );
+            if ( m_verbosity >= Verbosity::High) {
+                writeSourceInfo( desc_writer, info.lineInfo );
+            }
         }
     }
     void JsonReporter::listTags( std::vector<TagInfo> const& tags ) {

src/catch2/reporters/catch_reporter_json.hpp

@@ -85,9 +85,6 @@ namespace Catch {
         std::stack<Writer> m_writers{};
 
         bool m_startedListing = false;
-
-        // std::size_t m_sectionDepth = 0;
-        // std::size_t m_sectionStarted = 0;
     };
 } // namespace Catch