Merge pull request #665 from SonarSource/feature/drop-dashboards

SONAR-7030 Drop most default hardcoded built-in dashboards

diff --cc it/it-tests/src/test/java/it/Category1Suite.java
Simple merge

diff --cc server/sonar-server/src/main/java/org/sonar/server/platform/platformlevel/PlatformLevel4.java
Simple merge

diff --cc sonar-core/src/main/resources/org/sonar/l10n/core.properties
Simple merge