Cardano Updates

Addresses all review comments from PR #6580 (mgmeier). The root cause of
most issues was that `Cardano.Tracing.HasIssuer` was incorrectly deleted
as part of the iohk-monitoring cleanup

searchutxos

- Elab.hs: fix copy-paste error in binary arithmetic op elab (rhs hole was
  unified against lhsTy instead of rhsTy); rename evalBinaryArithmethicOpElabProblem
  to evalBinaryArithmeticOpElabProblem (typo)
- Elab.hs: elaborate `metrics` as List Text (was Text); add Str elab case
- Elab/Typing.hs, Resolve.hs, Unify.hs: add List Ty to support metrics type
- Interp.hs: guard avg/min/max against empty instant vector; fix rate to
  error on single-point timeseries instead of dividing by zero
- Interp/Value.hs: use showFFloat in Show instance for Scalar to avoid
  scientific notation in JSON output
- TimeseriesServer.hs: fix minimumRetentionMillis units (seconds → ms);
  remove unused RecordWildCards pragma; align sleep delay with Monitoring.hs
- Acceptors/Utils.hs: align new imports with surrounding import block

New routes on the timeseries server:
  GET /timeseries/nodes                        — list connected node IDs
  GET /timeseries/node/{id}/info               — NodeInfo + uptimeSeconds
  GET /timeseries/node/{id}/startup            — NodeStartupInfo
  GET /timeseries/node/{id}/state  (RTVIEW)    — sync progress %

The server now receives TracerEnv instead of individual fields so it can
access teDPRequestors, teCurrentDPLock, and teConnectedNodes.

The /state endpoint uses data point key "NodeAddBlock" (the namespace
cardano-node actually stores the NodeState data point under) rather than
"NodeState", which was always empty.

New query types in the datasource plugin:
  nodes       — lists all connected node IDs (used by $node_id variable)
  node-info   — name, protocol, version, commit, start time, uptime
  node-startup — era, slot length, epoch length, KES period
  node-state  — sync progress %

New panels in rtview.json (all repeat by $node_id variable):
  Connected Nodes table, Node Info table, Startup table,
  Sync % stat, Uptime stat

metricFindQuery populates the $node_id query variable automatically
from /timeseries/nodes.

$__from/$__to in timeseries queries are pre-processed to valid
timestamp expressions before template variable expansion.

Replace GNU ps long-option syntax with pgrep -P, which is available
on both macOS (BSD) and Linux.

Add 6-dense-timeseries-1h as a copy of 6-dense-1h with tracerTimeseries
enabled: 6 nodes, 1-hour duration, dense topology. The tracerTimeseries
combinator in Primitives.hs is retained. Regenerate all-profiles-coay.json.
Enable RTView in this profile.

Replace hardcoded [now - 1h; now] in all 25 dashboard panels with
[$__from; $__to] so the Grafana time picker controls the window.

Pre-process $__from/$__to in the datasource plugin before getTemplateSrv()
sees them — Grafana treats these as built-in variables and ignores
scopedVars overrides — converting them to epoch + Nms expressions that
the query language interprets as absolute timestamps.