Remove unsupported utf-8
Remove unsupported utf-8

Use decode to convert bytes to string (and string to string for
python2).

Closes #14248

SudiptaBiswas/moose,dschwen/moose,sapitts/moose,laagesen/moose,nuclear-wizard/moose,milljm/moose,laagesen/moose,andrsd/moose,nuclear-wizard/moose,lindsayad/moose,SudiptaBiswas/moose,idaholab/moose,bwspenc/moose,SudiptaBiswas/moose,bwspenc/moose,idaholab/moose,harterj/moose,sapitts/moose,jessecarterMOOSE/moose,laagesen/moose,lindsayad/moose,bwspenc/moose,harterj/moose,dschwen/moose,andrsd/moose,SudiptaBiswas/moose,dschwen/moose,milljm/moose,dschwen/moose,sapitts/moose,harterj/moose,nuclear-wizard/moose,SudiptaBiswas/moose,andrsd/moose,jessecarterMOOSE/moose,andrsd/moose,lindsayad/moose,idaholab/moose,andrsd/moose,dschwen/moose,jessecarterMOOSE/moose,harterj/moose,milljm/moose,jessecarterMOOSE/moose,lindsayad/moose,laagesen/moose,idaholab/moose,milljm/moose,nuclear-wizard/moose,bwspenc/moose,sapitts/moose,bwspenc/moose,idaholab/moose,sapitts/moose,laagesen/moose,harterj/moose,milljm/moose,lindsayad/moose,jessecarterMOOSE/moose