Ignore .rakeTasks generated from RubyMine*

What does this MR do?

JetBrains products such as RubyMine and the IntelliJ Ruby Plugin generates a .rakeTasks file.

Ignore this file from the qa/ directory.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• [-] Code review guidelines
• [-] Merge request performance guidelines
• [-] Style guides
• [-] Database guides
• [-] Separation of EE specific content

@zeffmorgan I believe you use IntelliJ/RubyMine, mind taking a look?

/labels Quality