Add tests for executeSystemTasks

[kishorebanala]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 3479

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 70.142%

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Totals
Change from base Build 3477:	0.04%
Covered Lines:	11154
Relevant Lines:	15902

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💛 - Coveralls

[codecov]

Codecov Report

Merging #1434 into dev will increase coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                dev    #1434      +/-   ##
============================================
+ Coverage     64.34%   64.42%   +0.08%     
- Complexity     3194     3199       +5     
============================================
  Files           262      262              
  Lines         15593    15593              
  Branches       1524     1524              
============================================
+ Hits          10033    10046      +13     
+ Misses         4723     4712      -11     
+ Partials        837      835       -2

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/netflix/conductor/jedis/JedisMock.java	9.8% <0%> (+0.49%)	21% <0%> (ø)	⬇️
...lix/conductor/core/execution/WorkflowExecutor.java	78.1% <0%> (+1.03%)	146% <0%> (+4%)	⬆️
...uctor/core/execution/tasks/WorkflowSystemTask.java	91.3% <0%> (+4.34%)	13% <0%> (+1%)	⬆️
...flix/conductor/core/execution/WorkflowSweeper.java	80.35% <0%> (+5.35%)	8% <0%> (ø)	⬇️

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