DynamoDB leadership election: return leadership success status

[sarahwada-stripe]

Context

DynamoDB leadership election: return leadership success status in tryToBecomeLeader.

We would like to capture leadership metrics. This change allows users to extend the class and inject instrumentation of the tryToBecomeLeader loop.

Also, small bug fix for dynamoDB delete where we are using the incorrect tablename.

cc @kmg-stripe

Checklist

• [x] ./gradlew build compiles code correctly
• [ ] Added new tests where applicable
• [x] ./gradlew test passes all tests
• [ ] Extended README or added javadocs where applicable

[github-actions[bot]]

Test Results

534 tests  ±0   528 :white_check_mark: ±0   7m 51s :stopwatch: -2s 139 suites ±0     6 :zzz: ±0  139 files   ±0     0 :x: ±0 

Results for commit a037acb1. ± Comparison against base commit e11c26dc.