[GOBBLIN-855] persist dag after addspec

[arjun4084346]

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below! @sv2000 please review

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):
  need to persist dag as soon as it is updated with the returned job future form addSpec()

Tests

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

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 #2711 into master will increase coverage by 40.88%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             master    #2711       +/-   ##
=============================================
+ Coverage      4.15%   45.03%   +40.88%     
- Complexity      736     8727     +7991     
=============================================
  Files          1879     1879               
  Lines         70111    70112        +1     
  Branches       7701     7701               
=============================================
+ Hits           2912    31577    +28665     
+ Misses        66893    35614    -31279     
- Partials        306     2921     +2615

Impacted Files	Coverage Δ	Complexity Δ
...blin/service/modules/orchestration/DagManager.java	74.62% <100%> (+74.62%)	11 <0> (+11)	⬆️
...ata/management/copy/hive/HivePartitionFileSet.java	0.95% <0%> (+0.95%)	1% <0%> (+1%)	⬆️
...ain/java/org/apache/gobblin/runtime/TaskState.java	81.97% <0%> (+1.16%)	32% <0%> (ø)	⬇️
...pache/gobblin/runtime/GobblinMultiTaskAttempt.java	56.3% <0%> (+1.35%)	27% <0%> (+2%)	⬆️
...ava/org/apache/gobblin/runtime/MultiConverter.java	83.6% <0%> (+1.63%)	9% <0%> (+1%)	⬆️
...rg/apache/gobblin/runtime/FsDatasetStateStore.java	73.8% <0%> (+1.78%)	35% <0%> (+1%)	⬆️
...a/org/apache/gobblin/cluster/SingleTaskRunner.java	1.85% <0%> (+1.85%)	1% <0%> (+1%)	⬆️
.../java/org/apache/gobblin/runtime/TaskExecutor.java	45.05% <0%> (+2.19%)	9% <0%> (+1%)	⬆️
...rg/apache/gobblin/runtime/AbstractJobLauncher.java	58.33% <0%> (+3.33%)	31% <0%> (+5%)	⬆️
...apache/gobblin/source/jdbc/SqlServerExtractor.java	4.41% <0%> (+4.41%)	3% <0%> (+3%)	⬆️
... and 1075 more

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[sv2000]

+1.