Document the --recover-deferred-snapshots option

[jstirnaman]

Problem

--recover-deferred-snapshots isn't documented anywhere in docs-v2.

The v3.11.3 release notes and the Enterprise storage engine configuration
reference both refer to it, because the new
--recover-deferred-snapshots-in-flight-limit option only has meaning in
relation to it. A reader who follows either reference finds no definition of
the option that does the recovering.

What's missing

The "Deferred snapshot recovery" section in
content/influxdb3/enterprise/reference/storage-engine-config-options.md
(under Compactor) documents the in-flight limit but not its parent option.
It needs a table row for --recover-deferred-snapshots covering:

• What the option does: returns deferred snapshots to compaction.
• Its default. Presumably disabled, but this needs engineering confirmation
  rather than an inference from the option name.
• Its type: whether it's a boolean flag or takes a value.
• Its environment variable, if it differs from the name-derived
  INFLUXDB3_RECOVER_DEFERRED_SNAPSHOTS.
• Whether it's safe to leave on permanently, or is meant to be set, run, and
  removed.

Context

Added in the v3.11.3 release notes work. See influxdb_pro#5502 for the
in-flight limit option that prompted this.

Done when

--recover-deferred-snapshots appears in the Enterprise storage engine
configuration reference with a confirmed default and behavior, and the
"Deferred snapshot recovery" section reads correctly without depending on
outside knowledge of the option.