* Add prefix to `origin` when configuration variables come from ini files
Fixes ansible#82387
This change was suggested by @bcoca in
https://github.com/ansible/ansible/pull/82388#discussion_r1424235728 and
https://github.com/ansible/ansible/pull/82388#discussion_r1424249732
When configuration variables come from an ini file, their `origin` is
now set to `ini: <file>`. Similarly, once supported, YAML configuration
files will have their `origin` as `yaml: <file>`.
Consequently, since unquoting configuration strings should happen if and
only if they come from an ini file, this condition boils down to testing
whether their `origin` starts with `ini:`.
* Do not add prefix to `origin` but explicitly pass `origin_ftype`
So as not to rely on a specific format of the `origin` string,
as suggested by @sivel in
https://github.com/ansible/ansible/pull/82388#issuecomment-1881714871
(cherry picked from commit 5f4e332e37)
Co-authored-by: snipfoo <79416808+snipfoo@users.noreply.github.com>