fix: Show button also when job-specific permissions are used

[mythsunwind]

Testing done

@piyugit reported that they experiencing issues with the latest version of the Flaky Tests plugin due to the "Deflake this build" option no longer being visible on jobs with job-specific permissions. I try to not only check Jenkins.get().hasPermission(Item.BUILD) but also run.getParent().hasPermission(Item.BUILD) now which should give me the job (job is parent of run) and then check for permissions there.

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[piyugit]

Hi @mythsunwind, I tested #37 , but the deflake option is still not visible to me even after manually loading it into the Jenkins. below are my permission level

1# We are part of QA group where we have all permissions see image=>

2# this is a overall permission structure (QA is a separate folder space of QA users)

It is only working even on the latest published version when QA folder/group got the access below

[piyugit]

Hi @mythsunwind any update?