chore(metrics): Replace cosmossdk.io/telemetry with prometheus/client_golang

[fridrik01]

This PR removes the use of cosmossdk.io/telemetry (which depends on go-metrics) and replaces it with direct usage of the Prometheus client library (prometheus/client_golang). This aligns beacon-kit with CometBFT’s metrics approach and brings several key improvements:

• Eliminates race conditions introduced by go-metrics.
• Avoids reliance on a questionably maintained upstream repo.
• Fixes problematic metric retention behavior.
• Simplifies and unifies metrics code across all services.

All components now expose metrics via a common metrics.Factory interface, which standardizes registration, labeling, and naming conventions.

Additionally:

• Replaces cosmossdk.io/store/metrics imports with a lightweight storage.NoOpStoreMetrics implementation to remove telemetry dependencies.
• While go-metrics remains a transitive dependency through cosmossdk.io/store/types, it is no longer used at runtime.

NOTE: Since this is a large PR I tried to make it backwards compatible as much as possible, even if it went against prometheus conventions. Future PRs could address these items separately:

• Kept the current metric names, requiring me to disable promlinter (which now correctly identifies naming issues that were previously undetected)
• Kept the duration in milliseconds even though prometheus standard unit should be in seconds (as float64) (https://prometheus.io/docs/practices/naming/)
• Kept using prometheus Summaries even though using Histograms is highly recommended (https://prometheus.io/docs/tutorials/understanding_metric_types/)

[codecov]

Codecov Report

❌ Patch coverage is 82.05374% with 187 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.15%. Comparing base (cc4ec8a) to head (5fe4aab).

Files with missing lines	Patch %	Lines
observability/metrics/prometheus/prometheus.go	36.06%	78 Missing ⚠️
execution/client/metrics.go	82.65%	30 Missing ⚠️
node-core/components/metrics_factory.go	17.14%	29 Missing ⚠️
execution/engine/metrics.go	84.13%	23 Missing ⚠️
config/config/config.go	0.00%	5 Missing ⚠️
state-transition/core/metrics.go	94.52%	4 Missing ⚠️
beacon/blockchain/blob_fetcher_metrics.go	95.83%	2 Missing ⚠️
beacon/blockchain/deposit.go	0.00%	2 Missing ⚠️
beacon/blockchain/metrics.go	97.22%	2 Missing ⚠️
cmd/beacond/defaults.go	0.00%	2 Missing ⚠️
... and 6 more

Additional details and impacted files

@@               Coverage Diff               @@
##           blobreactor    #2966      +/-   ##
===============================================
+ Coverage        63.24%   64.15%   +0.91%     
===============================================
  Files              367      371       +4     
  Lines            18014    18597     +583     
===============================================
+ Hits             11393    11931     +538     
- Misses            5713     5759      +46     
+ Partials           908      907       -1     

Files with missing lines	Coverage Δ
beacon/blockchain/blob_fetcher.go	73.39% <ø> (-0.48%)	⬇️
beacon/blockchain/blob_queue.go	58.87% <100.00%> (ø)
beacon/blockchain/service.go	86.84% <100.00%> (ø)
beacon/validator/metrics.go	100.00% <100.00%> (ø)
beacon/validator/service.go	100.00% <100.00%> (ø)
consensus/cometbft/service/prepare_proposal.go	83.33% <100.00%> (-0.35%)	⬇️
consensus/cometbft/service/process_proposal.go	49.29% <100.00%> (-0.71%)	⬇️
consensus/cometbft/service/service.go	39.89% <100.00%> (ø)
consensus/cometbft/service/state/state.go	51.51% <100.00%> (ø)
da/blob/factory.go	64.28% <100.00%> (ø)
... and 44 more

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