warning for periodic BCs in par

[dshaver-ANL]

Describe the bug
The code does not throw an error when trying to set periodic BC in the .par file.
A user may have a mesh where they have non-zero periodic BoundaryIDs (as with the wirehexmesher) and incorrectly try to set them in the par file. We should warn them when they try.

To Reproduce
include the following in a par file for a mesh with BCids 1, 2, 3, and 4
[VELOCITY]
boundaryTypeMap = wall, wall, periodic, periodic

Expected behavior
Is there any scenario where periodic BCs can or should be set in the par file? If not, we should catch this as an invalid BC choice.

Desktop (please complete the following information):

• OS: CentOS
• Version 7
• NekRS V23.0.3

Additional context
The code will echo this back

================ ELLIPTIC SETUP VELOCITY ================
bID 1 -> bcType zeroValue
bID 2 -> bcType zeroValue
bID 3 -> bcType periodic
bID 4 -> bcType periodic

which would imply this is the correct way to set the BC.