[WIP] Adding some protection logic to check jar file's existance before copying in CompactionSource

[autumnust]

WIP

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• [ ] My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-XXX

Description

• [ ] Here are some details about my PR, including screenshots (if applicable):

Tests

• [ ] My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• [ ] My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[codecov-io]

Codecov Report

Merging #3149 into master will decrease coverage by 4.26%. The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #3149      +/-   ##
============================================
- Coverage     46.05%   41.78%   -4.27%     
+ Complexity     9603     8761     -842     
============================================
  Files          1989     1989              
  Lines         75896    75900       +4     
  Branches       8452     8452              
============================================
- Hits          34953    31715    -3238     
- Misses        37662    41163    +3501     
+ Partials       3281     3022     -259     

Impacted Files	Coverage Δ	Complexity Δ
...he/gobblin/compaction/source/CompactionSource.java	0.00% <0.00%> (-72.09%)	0.00 <0.00> (-14.00)
.../org/apache/gobblin/util/filters/HiddenFilter.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-5.00%)
...g/apache/gobblin/cluster/HelixMessageSubTypes.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...gobblin/runtime/mapreduce/GobblinOutputFormat.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
.../gobblin/compaction/suite/CompactionSuiteBase.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-10.00%)
...obblin/compaction/source/CompactionFailedTask.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-3.00%)
...n/cluster/event/ClusterManagerShutdownRequest.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...blin/compaction/mapreduce/RecordKeyMapperBase.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...in/compaction/action/CompactionCompleteAction.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...n/compaction/mapreduce/orc/OrcKeyDedupReducer.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-10.00%)
... and 153 more

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