BE: Support "labels include all" #40721
Description
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Parent: #39916
Add labels_include_all as a third mutually exclusive label scoping option for software installers. Currently Fleet supports labels_include_any (host has ANY of the labels) and labels_exclude_any (host has NONE of the labels). This adds labels_include_all (host has ALL of the labels).
Task
Add labels_include_all support across the entire Go backend, including db migration, Go type definitions, datastore SQL queries, service-layer validation, API handlers, and activity logging.
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