[7.10] [kbn/std] add observable helpers to aid with rxjs 7 upgrade (#79752)#80090

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spalger merged 1 commit intoelastic:7.10from spalger:backport/7.10/pr-79752

Oct 9, 2020

+672-126

Commits on Oct 9, 2020

[kbn/std] add observable helpers to aid with rxjs 7 upgrade (elastic#79752 )

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