Unify editor version buttons

[timothyqiu]

There're three places that show a version button in the editor with slightly different texts:

	Text	Tooltip
Main Editor	4.4.dev	Git commit date: %s Click to copy the version information.
Project Manager	v4.4.dev.custom_build [HASH]	Git commit date: %s Click to copy the version information.
About Dialog	Godot Engine v4.4.dev.custom_build [HASH]	Git commit date: %s Click to copy the version number.

The text copied by clicking the button is the same v4.4.dev.custom_build [HASH].

This PR adds a dedicated EditorVersionButton to avoid repeating version button logic.

• Uses the "copy the version information" version for tooltip.
• Button text can be selected by an enum.

[akien-mga]

Thanks!