Add a hidden display hint on the poly type value virt. resolves SYN-10437

[infime]

This will allow optic to hide the value virt without hard coding since it won't be useful.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.42%. Comparing base (362548a) to head (1dd195e).
⚠️ Report is 7 commits behind head on synapse-3xx.

Additional details and impacted files

@@             Coverage Diff              @@
##           synapse-3xx    #4821   +/-   ##
============================================
  Coverage        96.41%   96.42%           
============================================
  Files              256      256           
  Lines            62439    62439           
============================================
+ Hits             60203    60205    +2     
+ Misses            2236     2234    -2     

Flag	Coverage Δ
linux	96.42% <ø> (+<0.01%)	⬆️

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