Add ability to quickly duplicate constraints/variants

[markphelps]

While working on setting up a simliar example as described in #732 in order to start working on a solution, I realized that it was very tedious to create constraints (and variants) that were based on existing ones with only minor differences.

Example:

Constraint 1: { property: 'environment', operator: 'eq', value: 'development' }

Constraint 2: { property: 'environment', operator: 'eq', value: 'staging' }

In this example the constraints only differ by the 'value', but in order to create these contraints in the UI I had to start from scratch each time.

This PR adds

1. 'duplicate' functionality in the UI for constraints and variants
2. labels for the icons in the constraints/variants tables
3. Minor description changes in the Taskfile.

Demo

[codecov-commenter]

Codecov Report

Merging #754 (e693e65) into master (19f536e) will increase coverage by 0.46%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #754      +/-   ##
==========================================
+ Coverage   82.09%   82.56%   +0.46%     
==========================================
  Files          19       19              
  Lines        1709     1709              
==========================================
+ Hits         1403     1411       +8     
+ Misses        253      249       -4     
+ Partials       53       49       -4     

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