Revert "Add edge:add and edge:del as trigger conditions, resolves SYN-5974 (#3360)"

[vEpiphyte]

This reverts commit 7bd4018.

This will be revised for the next release.

#3360

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (0002641) 97.31% compared to head (da8fdfe) 97.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3388      +/-   ##
==========================================
- Coverage   97.31%   97.21%   -0.11%     
==========================================
  Files         230      230              
  Lines       47059    46896     -163     
==========================================
- Hits        45797    45589     -208     
- Misses       1262     1307      +45     

Flag	Coverage Δ
linux	97.21% <100.00%> (-0.01%)	⬇️
linux_replay	?

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Files	Coverage Δ
synapse/lib/cache.py	100.00% <100.00%> (ø)
synapse/lib/snap.py	95.97% <ø> (+0.14%)	⬆️
synapse/lib/storm.py	95.71% <ø> (ø)
synapse/lib/stormtypes.py	98.76% <ø> (-0.01%)	⬇️
synapse/lib/trigger.py	95.03% <100.00%> (-1.56%)	⬇️
synapse/lib/view.py	97.17% <ø> (-0.37%)	⬇️
synapse/models/syn.py	98.41% <ø> (ø)

... and 8 files with indirect coverage changes

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