[8.10] fix(slo): use insert_zeros gap policy for historical summary calculation (#168044)

[kdelemme]

Backport

This will backport the following commits from main to 8.10:

• fix(slo): use insert_zeros gap policy for historical summary calculation (#168044)

Questions ?

Please refer to the Backport tool documentation

[apmmachine]

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[kibana-ci]

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