Fixes custom action parsing

[downsrob]

Signed-off-by: Clay Downs [email protected]

Issue #, if available:
NA

Description of changes:
Fixes custom action parsing which was failing due to having the token assertions in the wrong order. Custom parsing was being tested exclusively through unit tests, and there was no unit test for actually parsing an extension action written out with the "custom" wrapper, adds that unit test.

CheckList:

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[codecov-commenter]

Codecov Report

Merging #309 (045d79e) into main (6d93359) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #309      +/-   ##
============================================
+ Coverage     75.55%   75.60%   +0.05%     
- Complexity     2001     2003       +2     
============================================
  Files           253      253              
  Lines         11467    11467              
  Branches       1815     1815              
============================================
+ Hits           8664     8670       +6     
+ Misses         1772     1764       -8     
- Partials       1031     1033       +2     

Impacted Files	Coverage Δ
...anagement/indexstatemanagement/ISMActionsParser.kt	88.52% <100.00%> (+8.19%)	⬆️
.../rollup/action/start/TransportStartRollupAction.kt	66.27% <0.00%> (-3.49%)	⬇️
...anagement/indexstatemanagement/model/Transition.kt	64.78% <0.00%> (-2.82%)	⬇️
...nt/rollup/action/stop/TransportStopRollupAction.kt	70.93% <0.00%> (-1.17%)	⬇️
...nt/indexstatemanagement/ManagedIndexCoordinator.kt	72.18% <0.00%> (-0.63%)	⬇️
.../opensearch/indexmanagement/rollup/model/Rollup.kt	84.43% <0.00%> (-0.48%)	⬇️
...earch/indexmanagement/transform/model/Transform.kt	85.65% <0.00%> (+0.43%)	⬆️
...gement/transform/model/ContinuousTransformStats.kt	69.23% <0.00%> (+3.84%)	⬆️
.../opensearch/indexmanagement/rollup/RollupRunner.kt	69.91% <0.00%> (+4.42%)	⬆️
... and 1 more

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