The variables `certificate_authority_root_ca_subject_alternative_names` and
`certificate_authority_intermediate_ca_subject_alternative_names` were
documented but never referenced by any task, so both CA certificates were always
issued without SANs. Wire them into the corresponding CSR tasks and fall back to
`omit` when the list is empty.
SAN entries are now passed to `openssl_csr` unchanged instead of being prefixed
with `DNS:` by the role. This allows other types such as `IP:` or `email:`,
which the previous rewrite would have corrupted into values like `DNS:IP:...`.
The client tasks additionally dropped `join(',') | quote`, because `quote`
performs shell escaping and `openssl_csr` expects a list.
Since both client CSR tasks only differed in `subject_alt_name`, they collapse
into a single task per file.
BREAKING CHANGE: Entries of all `*_subject_alternative_names` variables must now
carry their type prefix, for example `DNS:example.local` instead of
`example.local`.
Co-authored-by: Copilot <copilot@github.com>