Delete resources in the sink DB and FHIR server

[chandrashekar-s]

Description of what I changed

Fixes #588 Delete the FHIR resources in the Sink DB and Sink FHIR servers during export.

E2E test

Relied on e2e tests.

TESTED:

Manually tested by deleting the resources from the source FHIR server and verifying the same from the sink systems.

Checklist: I completed these to help reviewers :)

• [x] I have read and will follow the review process.

• [x] I am familiar with Google Style Guides for the language I have coded in.

  No? Please take some time and review Java and Python style guides.

• [x] My IDE is configured to follow the Google code styles.

  No? Unsure? -> configure your IDE.

• [x] I have added tests to cover my changes. (If you refactored existing code that was well tested you do not have to add tests)

• [x] I ran mvn clean package right before creating this pull request and added all formatting changes to my commit.

• [x] All new and existing tests passed.

• [x] My pull request is based on the latest changes of the master branch.

  No? Unsure? -> execute command git pull --rebase upstream master

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 32.00000% with 17 lines in your changes missing coverage. Please review.

Project coverage is 51.43%. Comparing base (062cc3d) to head (b1f8ddf).

Files with missing lines	Patch %	Lines
.../com/google/fhir/analytics/JdbcResourceWriter.java	20.00%	7 Missing and 1 partial :warning:
...a/com/google/fhir/analytics/ConvertResourceFn.java	12.50%	6 Missing and 1 partial :warning:
.../java/com/google/fhir/analytics/FhirStoreUtil.java	71.42%	1 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1183      +/-   ##
============================================
+ Coverage     51.34%   51.43%   +0.08%     
- Complexity      711      715       +4     
============================================
  Files            95       95              
  Lines          5886     5907      +21     
  Branches        781      787       +6     
============================================
+ Hits           3022     3038      +16     
- Misses         2578     2581       +3     
- Partials        286      288       +2     

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[chandrashekar-s]

@bashir2 Sorry for the delay in addressing the review comments. Please have a look at my recent changes.