Revert "Add label elements to scheduler and visibility"

[aduth]

Reverts #3317
See #3317 (comment)

cc @afercia @Soean

[codecov]

Codecov Report

Merging #3358 into master will decrease coverage by 0.05%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #3358      +/-   ##
==========================================
- Coverage   31.11%   31.06%   -0.06%     
==========================================
  Files         245      245              
  Lines        6718     6716       -2     
  Branches     1205     1205              
==========================================
- Hits         2090     2086       -4     
- Misses       3893     3895       +2     
  Partials      735      735

Impacted Files	Coverage Δ
editor/sidebar/post-visibility/index.js	40% <0%> (-26.67%)	⬇️
editor/sidebar/post-schedule/index.js	50% <0%> (-21.43%)	⬇️

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