Remove nightly builds for ignite-2.14

[Zhenya Stanilovsky]

I found that nightly builds for 2.14 still active [1] can someone fix it ?
 
[1]  
https://ci2.ignite.apache.org/buildConfiguration/IgniteTests24Java8_RunAllNightly/7245960?hideProblemsFromDependencies=false&hideTestsFromDependencies=false&expandCode+Inspection=true&expandBuildTestsSection=true