Add new groups for examples packs

Also, remove version numbers. Will make it easier to avoid publishing
the examples packs.

java/ql/examples/qlpack.yml

@@ -1,4 +1,6 @@
 name: codeql/java-examples
-version: 0.0.2
+groups: 
+  - java
+  - examples
 dependencies:
-    codeql/java-all: "*"
+  codeql/java-all: "*"

java/ql/src/qlpack.yml

@@ -1,9 +1,11 @@
 name: codeql/java-queries
 version: 0.0.8-dev
-groups: java
+groups: 
+  - java
+  - queries
 suites: codeql-suites
 extractor: java
 defaultSuiteFile: codeql-suites/java-code-scanning.qls
 dependencies:
-    codeql/java-all: "*"
-    codeql/suite-helpers: "*"
+  codeql/java-all: "*"
+  codeql/suite-helpers: "*"