[GOBBLIN-2210] Wrap temporal heartbeat runnable

[Blazer-007]

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-2210

Description

• Here are some details about my PR, including screenshots (if applicable):
  Temporal heartbeat is sent periodically using ScheduledExecutorService but in case any exception is thrown while sending heartbeat from temporal it will kill the heartbeat runnable task and even though activity might be still running it will be killed after sometime when server doesn't receive any heartbeat from activity, to avoid this we can wrap the runnable to print exception instead so that next heartbeat events can be sent properly
  • Added safeRunnable in ExecutorsUtils
  • Refactored Activity codes to use safeRunnable

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:
  testSafeRunnableRunsSuccessfully,testSafeRunnableHandlesException

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"

[thisisArjit]

should we log stacktrace?

[Blazer-007]

Logging stacktrace will bloat the log messages, only motivation to wrap the thread is to avoid killing of thread.
Added a log line in debug mode

[codecov-commenter]

Codecov Report

❌ Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.82%. Comparing base (adef734) to head (f914aa5).
⚠️ Report is 34 commits behind head on master.

Files with missing lines	Patch %	Lines
...temporal/ddm/activity/impl/CommitActivityImpl.java	0.00%	1 Missing ⚠️
...poral/ddm/activity/impl/GenerateWorkUnitsImpl.java	0.00%	1 Missing ⚠️
...emporal/ddm/activity/impl/ProcessWorkUnitImpl.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4119      +/-   ##
============================================
- Coverage     45.38%   42.82%   -2.56%     
+ Complexity     3192     2482     -710     
============================================
  Files           696      513     -183     
  Lines         26628    21748    -4880     
  Branches       2655     2478     -177     
============================================
- Hits          12085     9314    -2771     
+ Misses        13542    11479    -2063     
+ Partials       1001      955      -46     

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