Ignore queue exceptions in terminate workflow logic.

[kishorebanala]

Failure to remove from queue during terminate wouldn't cause any side effects, and can be cleaned up in subsequent operations. However, queue exceptions are catched as blockers in terminateWorkflow logic, ignoring subsequent operations in terminate logic like canceling the tasks, starting the failure workflow etc.

This PR will catch and log the queue remove exceptions, and continue with terminate workflow logic.

[codecov]

Codecov Report

Merging #1863 into dev will increase coverage by 0.02%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##                dev    #1863      +/-   ##
============================================
+ Coverage     64.97%   65.00%   +0.02%     
+ Complexity     3871     3867       -4     
============================================
  Files           298      298              
  Lines         18383    18386       +3     
  Branches       1674     1674              
============================================
+ Hits          11945    11951       +6     
+ Misses         5610     5607       -3     
  Partials        828      828              

Impacted Files	Coverage Δ	Complexity Δ
...lix/conductor/core/execution/WorkflowExecutor.java	77.86% <83.33%> (+0.08%)	180.00 <1.00> (ø)
...ix/conductor/dao/postgres/PostgresMetadataDAO.java	77.00% <0.00%> (-5.35%)	66.00% <0.00%> (-3.00%)
.../conductor/dao/cassandra/CassandraMetadataDAO.java	58.03% <0.00%> (+2.59%)	24.00% <0.00%> (-1.00%)	⬆️
...ductor/dao/cassandra/CassandraEventHandlerDAO.java	76.31% <0.00%> (+10.52%)	15.00% <0.00%> (ø%)

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[coveralls]

Pull Request Test Coverage Report for Build 4520

• 5 of 6 (83.33%) changed or added relevant lines in 1 file are covered.
• 13 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.07%) to 69.45%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/src/main/java/com/netflix/conductor/core/execution/WorkflowExecutor.java	5	6	83.33%

Files with Coverage Reduction	New Missed Lines	%
cassandra-persistence/src/main/java/com/netflix/conductor/dao/cassandra/CassandraMetadataDAO.java	2	55.44%
postgres-persistence/src/main/java/com/netflix/conductor/dao/postgres/PostgresMetadataDAO.java	11	80.75%

Totals
Change from base Build 4501:	-0.07%
Covered Lines:	12769
Relevant Lines:	18386

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💛 - Coveralls