Fixes a new transition not using new step start time if previous step…

[dbbaughe]

… was also a transition

Issue #, if available:
#380

Description of changes:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #381 (a351c00) into master (ed27978) will decrease coverage by 0.23%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #381      +/-   ##
============================================
- Coverage     76.74%   76.50%   -0.24%     
- Complexity     1458     1461       +3     
============================================
  Files           188      188              
  Lines          7333     7335       +2     
  Branches       1187     1190       +3     
============================================
- Hits           5628     5612      -16     
- Misses         1062     1078      +16     
- Partials        643      645       +2     

Impacted Files	Coverage Δ	Complexity Δ
.../indexmanagement/indexstatemanagement/step/Step.kt	100.00% <100.00%> (ø)	9.00 <4.00> (+1.00)
...statemanagement/model/destination/CustomWebhook.kt	65.21% <0.00%> (-28.99%)	12.00% <0.00%> (-2.00%)
...anagement/indexstatemanagement/model/Transition.kt	63.07% <0.00%> (-4.62%)	5.00% <0.00%> (ø%)
...icsearch/indexmanagement/rollup/model/ISMRollup.kt	94.44% <0.00%> (+1.85%)	29.00% <0.00%> (+2.00%)
...nt/indexstatemanagement/model/destination/Chime.kt	54.54% <0.00%> (+13.63%)	4.00% <0.00%> (+2.00%)

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