docs/victorialogs/logsql.md: clarify _time recommendation for Web UI and Grafana

.github: Set 21-day cooldown to dependabot updates (#1262)

app/vlagent/kubernetescollector: simplify processor creation (#1263)

docs/victorialogs/CHANGELOG.md: fix incorrect link to field_values pipe

lib/logstorage: properly handle the when pipeUnion.q is nil inside isPipeSafeForHits

app/vmui/packages/vmui/src/components/DownloadLogs/DownloadLogsModal.tsx: remove an obsolete alert saying that the qeury must end with pipes specifying the columns to return when exporting the selected logs in CSV format

deployment: update VictoriaLogs Docker image tag from v1.48.0 to v1.49.0

docs/victorialogs/CHANGELOG.md: cut v1.49.0 release

app/vlselect/vmui: run `make vmui-update` after the commit ef72730cca61af5f00176ea03f84f7344d117864

vendor: run `make vendor-update`

app/vlagent/kubernetescollector: move tail logic to a separate package (#1197)

bugfix: fix unsupported metric type for summary (#1259)

lib/logstorage: support `switch(case ..., default ...)` syntax inside `stats` pipe

logsql: return empty when offset >= rows in last-N optimization (#1191)

app/vlagent: migrate to `timeutil.BackoffTimer` (#1257)