Disable clickhouse. (#6246)

I merged https://github.com/google/oss-fuzz/pull/6244
too quickly. Clickhouse fails to build.
Disable temporarily to prevent exceptions since
clickhouse is new
diff --git a/projects/clickhouse/project.yaml b/projects/clickhouse/project.yaml
index bee17b2..c3972d5 100644
--- a/projects/clickhouse/project.yaml
+++ b/projects/clickhouse/project.yaml
@@ -12,3 +12,4 @@
     experimental: True
  - undefined
 main_repo: 'https://github.com/ClickHouse/ClickHouse.git'
+disabled: True