Allow Viewport children to lock, group, and insert keyframes

[kitbdev]

• Fixes Locking isnt working if the node is witihin the Viewport #30910
• Closes Viewport nodes give no user feedback explaining that they can't be ungrouped. #51539
• Originally disabled in 2D viewport issues #1383
• Related Enable editing of controls inside viewports in editor #99401

In the 2D Editor, allows lock, unlock, group, ungroup, copy pose, clear pose, and insert keyframe while there is a Viewport ancestor.
In the 3D Editor, allows lock, unlock, group, and ungroup.

• Lock and group icon positions in viewports are fixed in Fix selecting and editing invisble items in SubViewports #99942

[KoBeWi]

Like in #99401 (comment), this allows locking nodes outside the current scene, but not insert keyframes. It's also not really a problem though.

[KoBeWi]

I don't get why it was disabled in the first place tbh.

[akien-mga]

Thanks!