Added .idea folder to .gitignore

[jackdelahunt]

Description

Adds the .idea folder generated by Jetbrains IDEs to the gitignore

• [x] The commits are squashed in a cohesive manner and have meaningful messages.
• [x] Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• [x] The developer has manually tested the changes and verified that the changes work

[openshift-ci[bot]]

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[LaVLaS]

My personal preference is the .gitignore file only includes files that are generated by or created in support of workflows executed from within the repo. Artifacts generated by individual developers IDEs should be added to your global gitignore so that it applies to all git repos on your local machine.