ci: fix debug step to not exit on gradle failure, show grep output

1 job for main in 3 minutes and 22 seconds
Status Job ID Name Coverage
  Build
failed #127728
studio-2023 triggered
ci-build

00:03:22

 
Name Stage Failure
failed
ci-build Build
  output: [ null, null, null ],
pid: 55775,
stdout: null,
stderr: null
}

Node.js v18.18.2
Cleaning up project directory and file based variables
ERROR: Job failed: exit status 1