config: enable validation framework for onboarded repositories

[hdamker]

What type of PR is this?

repository management

What this PR does / why we need it:

Flips per-repo validation stage from advisory (central default) to enabled
for production repositories running the v1-rc validation framework, and
pre-stages two repositories with onboarding PRs in flight.

Effective immediately for the 12 repositories with camara-validation.yml
already installed. The entries for DeviceIdentifier and EdgeApplicationManagement
are pre-staged and become effective once their respective onboarding PRs merge.

Per-repo follow-ups outside this PR: disable the v0 caller workflows
(pr_validation_caller.yml, spectral-oas-caller.yml) via the Actions API
and file a tracking issue per repo for eventual file removal at v1 GA
(precedent: SimpleEdgeDiscovery#164).

Which issue(s) this PR fixes:

Tracked under camaraproject/ReleaseManagement#484.

Special notes for reviewers:

Schema is permissive (additionalProperties: true); pre-staged entries for
repositories without camara-validation.yml are inert until each repo's
onboarding PR merges.

Inline date comments (# YYYY-MM-DD) record when each entry was added so the
file's rollout timeline is readable without git-log spelunking.

Changelog input

 release-note
N/A — runtime configuration only.

Additional documentation

docs
N/A