[JJBB] fix credentials with a service account

[v1v]

What does this PR do?

Revert some changes partially of #19852 to fix some misconfiguration with the GH accounts in the golang-crossbuild project

Why is it important?

To fix

No changes detected: master (still at 7fe9c7c0bcde40f473473271f8b807557d74c683)

  1 branches were processed

  Checking pull-requests...

    Checking pull request elastic/beats#65

  Error while processing pull request 65

  Reason: org.kohsuke.github.GHFileNotFoundException: https://api.github.com/repos/elastic/golang-crossbuild/collaborators/kuisathaverat/permission {"message":"Resource not accessible by integration","documentation_url":"https://docs.github.com/rest/reference/repos#get-repository-permissions-for-a-user"}

    Checking pull request elastic/beats#62

  Error while processing pull request 62

  Reason: org.kohsuke.github.GHFileNotFoundException: https://api.github.com/repos/elastic/golang-crossbuild/collaborators/kuisathaverat/permission {"message":"Resource not accessible by integration","documentation_url":"https://docs.github.com/rest/reference/repos#get-repository-permissions-for-a-user"}

    Checking pull request elastic/beats#43

  Error while processing pull request 43

  Reason: org.kohsuke.github.GHFileNotFoundException: https://api.github.com/repos/elastic/golang-crossbuild/collaborators/null/permission {"message":"Resource not accessible by integration","documentation_url":"https://docs.github.com/rest/reference/repos#get-repository-permissions-for-a-user"}

  3 pull requests were processed

  3 pull requests encountered errors and were orphaned.

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Finished examining elastic/golang-crossbuild

[Tue Aug 11 06:56:46 UTC 2020] Finished branch indexing. Indexing took 3.3 sec
Finished: SUCCESS

Further details

I did add the elasticmachine and apmmachine as maintainers of the project with the same outcome. I don't know if the issue could related to some cache inconsistency in the CI side, some plugin misbehaving, or something internal with GH. To workaround this particular issue I've decided to revert partially the changes I did to use the GH app credentials.

[elasticmachine]

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Build stats

• Build Cause: [Pull request #20535 opened]

• Start Time: 2020-08-11T07:05:39.150+0000

• Duration: 22 min 16 sec