CP-49446: Update SR health to include new constructors

[contificate]

Currently, the storage layer tracks two extra SR health statuses that XAPI is unaware of. These are "unreachable" and "unavailable". At present, the storage side simply maps these to "recovering" when sending information to the toolstack. This change will allow XAPI to track more accurate SR health statuses.

See this excerpt from xapi-storage-plugins (util.py) which maps these new constructors to the extant "recovering" enum.

def sr_status_to_xapi(sr_status):
    """
    Convert the SR statuses we know internally into a String which XAPI understands.
    This small layer of indirection allows us to experiment with more states than XAPI
    knows of internally, until such time as XAPI is ready to learn of them.
    """
    if sr_status == SR_STATUS_OK:
        return "Healthy"
    if sr_status == SR_STATUS_RECOVERING:
        return "Recovering"
    if sr_status == SR_STATUS_UNREACHABLE:
        # XAPI does not yet understand "Unreachable"
        return "Recovering"
    if sr_status == SR_STATUS_UNAVAILABLE:
        # XAPI does not yet understand "Unavailable"
        return "Recovering"

[psafont]

The failure happens because the external API changed.
The hash in the test binary needs to be changed, and the minor_vsn in ocaml/idl/datamodel_common.ml (line 13)

File "ocaml/idl/dune", line 52, characters 8-18:
52 |   (name schematest)
             ^^^^^^^^^^
(cd _build/default/ocaml/idl && ./schematest.exe)


New schema hash ('9cdffb92b17ec72818be9fb32a5f87b8') doesn't match the last known one. Please bump the
datamodel schema versions if necessary, and update 'last_known_schema_hash'.

[psafont]

The commits should be squashed before merging

[robhoes]

Please update the ~lifecycle arg of the health field definition below, which this enum is used to indicate the change. E.g.:

~lifecycle:[(Prototyped, rel_kolkata, ""); (Published, rel_lima, ""); Extended, "24.16.0", "Enum extended with 'unreachable' and 'unavailable' values"]