Cherry-pick to 7.x: [packaging] Normalise GCP bucket folder structure (#20903)#20925

Merged

v1v merged 1 commit intoelastic:7.xfrom v1v:backport/7.x/pr-20903

Sep 2, 2020

+15-3

Commits on Sep 2, 2020

[packaging] Normalise GCP bucket folder structure (elastic#20903 )
v1v
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