feat(intake): regenerate the SDK for the span group time sort

Adding started_at to SpanGroup and to the sort enum changed the published
contract, so the checked-in SDK and CLI went stale and CI's sync check failed.
Regenerating gives SpanGroup a started_at field, widens SpanGroupSortField to
include started_at and -started_at, and carries the sort guidance into both CLIs
and the reference docs.

Signed-off-by: Alec Khoury <akhoury@nvidia.com>

Author: aleckhoury

docs/cli/reference.mdx

@@ -6955,7 +6955,7 @@ nemo intake spans groups list [OPTIONS]
 * `--by`: Comma-separated span fields to group by, e.g.
 * `--page <INTEGER>`: Page number.
 * `--page-size <INTEGER>`: Page size.
-* `--sort <CHOICE>`: [possible values: span_count, -span_count]
+* `--sort <CHOICE>`: Sort groups by size or by time. Use -started_at to get the most recent traces or sessions first, which answers 'what ran lately' in one call instead of paging through spans. [possible values: span_count, -span_count, started_at, -started_at]
 * `--all-pages`: Fetch all pages
 
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