fix: Falling into the void at the Pocket Dimension exit

[MS-crew]

Description

Describe the changes
Falling into the void at the Pocket Dimension exit

What is the current behavior? (You can also link to an open issue here)
If you went to the pocket dimension by teleportation or displacement, you would fall into the void.

What is the new behavior? (if this is a feature change)
If the position is invalid, a safe position is returned

Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
No

Other information:

Types of changes

• 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 change)
• Documentations

Submission checklist

• I have checked the project can be compiled
• I have tested my changes and it worked as expected

Patches (if there are any changes related to Harmony patches)

• I have checked no IL patching errors in the console

Other

• Still requires more testing

[louis1706]

Make default Scp106 room that would be better also add warning for it it's not normal than people get vector3.zero position (will probably remove it once we did report it to nw how to reproduce this)

[VALERA771]

Are you sure that players won't be dropped into the void?

[MS-crew]

Are you sure that players won't be dropped into the void?

Hmm so yes, that bug is there for a part of it, but if you go to Pocket from a place where there is no room, you can still end up in the void. So, this only fixed part of it. Maybe we should check with trygetroom instead of Vector3 Zero.