Fix emojis showing title instead of popup shortcode

[aryanjassal]

Description

This PR replaces the title popup with a tooltip for displaying the shortcode of an emoji in messages within a room. This also aligns the behaviour with hovering over a reaction.

Fixes #2652

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[github-actions]

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[aryanjassal]

I have read the CLA Document and I hereby sign the CLA

[github-actions]

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[ajbura]

overall looks good. I think we also need to add this to the custom emojis.