Backport of agent/template: fix exec parsing error for templates into release/1.11.x #16233
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Backport
This PR is auto-generated from #16231 to be assessed for backporting due to the inclusion of the label backport/1.11.x.
The below text is copied from the body of the original PR.
When attempting to parse
exec
in template stanzas, the map was being decoded as a slice, but exec expects a map:This is similar to
wait
and needs to be treated appropriately by flattening the slice.Fixes #16230.
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