fix(DC): Bring EntityContainsColumnsValidator back to config entities

[volokluev]

A repeat of #3540 but fixing two bad lines of code which should not have been merged

Due to a bug in our testing, we have not been including the EntityContainsColumnsValidator in the entities built with config. Having a place where the built in validators are defined makes it easier to auto-convert entities as we can skip the default ones in the config.

Blast Radius

This will affect only config entities (metrics) and this is re-introducing a columns validator which is turned off. This is essentially a no-op.

[codecov-commenter]

Codecov Report

Base: 92.05% // Head: 92.46% // Increases project coverage by +0.41% 🎉

Coverage data is based on head (04032be) compared to base (beb4dcd).
Patch coverage: 94.11% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3579      +/-   ##
==========================================
+ Coverage   92.05%   92.46%   +0.41%     
==========================================
  Files         732      733       +1     
  Lines       33906    33972      +66     
==========================================
+ Hits        31211    31412     +201     
+ Misses       2695     2560     -135     

Impacted Files	Coverage Δ
snuba/datasets/entities/discover.py	100.00% <ø> (ø)
snuba/datasets/entities/events.py	100.00% <ø> (ø)
snuba/datasets/entities/functions.py	95.45% <ø> (ø)
snuba/datasets/entities/generic_metrics.py	97.91% <0.00%> (ø)
snuba/datasets/entities/metrics.py	100.00% <ø> (ø)
snuba/datasets/entities/outcomes.py	100.00% <ø> (ø)
snuba/datasets/entities/outcomes_raw.py	95.83% <ø> (ø)
snuba/datasets/entities/profiles.py	96.15% <ø> (ø)
snuba/datasets/entities/replays.py	100.00% <ø> (ø)
snuba/datasets/entities/sessions.py	100.00% <ø> (ø)
... and 21 more

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