Increase time_parser's test coverage

[jsirianni]

Increased test coverage from 66.7% to 100%. 66% coverage is somewhat misleading as the existing test cases are very thorough when it comes to testing various time formats and inputs. Some coverage was missing for Build and Process.

[codecov]

Codecov Report

Merging #280 (e2c3907) into main (192c163) will increase coverage by 0.1%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            main    #280     +/-   ##
=======================================
+ Coverage   76.4%   76.5%   +0.1%     
=======================================
  Files         95      95             
  Lines       4454    4454             
=======================================
+ Hits        3404    3409      +5     
+ Misses       719     716      -3     
+ Partials     331     329      -2     

Impacted Files	Coverage Δ
operator/builtin/parser/time/time.go	100.0% <0.0%> (+33.3%)	⬆️