Move issue list title back to inline

What does this MR do and why?

In !149865 (merged) the issue title row was made into a flex container, which meant the confidential icon was abutting the title and the title no longer wrapped under icon, along with unintentional resizing.

This MR moves this back to an inline row to maintain the prior spacing and wrapping. This means the epic helper icon appears at the end of the title, rather than next to the title, when the title wraps.

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How to set up and validate locally

Open an issue list in a group or project with at least 1 confidential issue