Add the ANTHROPIC connector_provider enum value, its migration, and the
GraphQL enum binding, then register the provider as an API-key connector
that authenticates via x-api-key.
The probe URL is left empty because the shared connection probe cannot
send the required anthropic-version header and would misreport a valid
key; a dead key surfaces on the first member fetch instead.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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