Fix github-tests project setup

github-tests were not running on the server, because nobody depended
on the module. The solution was either to write the module explicitly
to the main-idea-tests configuration, or to move the tests to github
module.

Tests were not moved to github module initially because they depend
on jira-connector (because tasks-tests depend on jira-connector).
Adding tasks-tests test dependency is impossible,
because they depend on testframework-java (which leads to prefix
problems).

Therefore it is decided to move github tests back to the github
module, and add jira-connector as a test dependency to it.

plugins/github/github-test/github-test.iml

@@ -2,9 +2,6 @@
 <module type="JAVA_MODULE" version="4">
   <component name="NewModuleRootManager" inherit-compiler-output="true">
     <exclude-output />
-    <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
-    </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="module" module-name="platform-api" scope="TEST" />