fix: YAML>JSON integration REST returns duplicated START step

[igarashitm]

Fixes: #497

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.4% Duplication

[codecov]

Codecov Report

Merging #498 (3ad5de0) into main (3ec551a) will increase coverage by 0.31%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #498      +/-   ##
============================================
+ Coverage     79.29%   79.61%   +0.31%     
- Complexity      131      132       +1     
============================================
  Files            45       45              
  Lines          2198     2198              
  Branches        321      321              
============================================
+ Hits           1743     1750       +7     
+ Misses          299      294       -5     
+ Partials        156      154       -2     

Impacted Files	Coverage Δ
...parser/camelroute/CamelRouteStepParserService.java	79.48% <100.00%> (+10.25%)	⬆️
.../backend/api/resource/v1/IntegrationsResource.java	73.21% <0.00%> (+5.35%)	⬆️

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