Add built-in variables run_today_h and run_today_h_std

[peacewong]

What is the purpose of the change

close #2179

Brief change log

• Add built-in variables run_today_h and run_today_h_std

Verifying this change

(Please pick either of the following options)
This change is a trivial rework / code cleanup without any test coverage.
(or)
This change is already covered by existing tests, such as (please describe tests).
(or)
This change added tests and can be verified as follows:

• Add custom variable test class

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• Anything that affects deployment: (no)
• The MGS(Microservice Governance Services), i.e., Spring Cloud Gateway, OpenFeign, Eureka.: (no)

[codecov]

Codecov Report

Merging #2299 (f59fe6a) into dev-1.2.0 (caccf89) will increase coverage by 1.88%.
The diff coverage is 77.92%.

@@               Coverage Diff               @@
##             dev-1.2.0    #2299      +/-   ##
===============================================
+ Coverage        20.56%   22.45%   +1.88%     
- Complexity        1055     1061       +6     
===============================================
  Files              455      455              
  Lines            13920    13963      +43     
  Branches          2192     2200       +8     
===============================================
+ Hits              2863     3135     +272     
+ Misses           10668    10390     -278     
- Partials           389      438      +49     

Impacted Files	Coverage Δ
...g/apache/linkis/common/variable/VariableType.scala	17.80% <33.33%> (+17.80%)	⬆️
...apache/linkis/common/variable/CustomDateType.scala	57.62% <50.00%> (+57.62%)	⬆️
.../apache/linkis/common/variable/DateTypeUtils.scala	74.78% <80.00%> (+74.78%)	⬆️
...org/apache/linkis/common/utils/VariableUtils.scala	60.11% <100.00%> (+60.11%)	⬆️
...s/scheduler/queue/fifoqueue/FIFOUserConsumer.scala	34.44% <0.00%> (+1.11%)	⬆️

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[utopianet]

LGTM