Salvages #50469 by @libre-7.
_dashboard_local_update_managed_externally() previously blocked every containerized dashboard from the local update API, even when the running install was a bind-mounted git checkout that can be updated with hermes update.
Allow the dashboard updater only for git installs inside containers, while keeping hosted /opt/data, docker, and pip installs managed externally. Pip remains blocked because its apply path mutates the running container filesystem and is not the self-managed checkout case.
Adds regression coverage for docker, git, and pip install-method handling inside containers, and maps the contributor email for release attribution.
Co-authored-by: libre-7 <libre-7@users.noreply.github.com>
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