Remove Sentry::Metrics and config.metrics and all metrics related code

[sl0thentr0py]

Issues

• Go over deprecations #2718
• RUBY-99

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.22%. Comparing base (912bc1b) to head (67ff8f8).
⚠️ Report is 1 commits behind head on 6.0-dev.

Files with missing lines	Patch %	Lines
sentry-ruby/lib/sentry/span.rb	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           6.0-dev    #2729      +/-   ##
===========================================
- Coverage    97.40%   97.22%   -0.19%     
===========================================
  Files          142      132      -10     
  Lines         5636     5302     -334     
===========================================
- Hits          5490     5155     -335     
- Misses         146      147       +1     

Components	Coverage Δ
sentry-ruby	97.47% <75.00%> (-0.23%)	⬇️
sentry-rails	96.52% <ø> (ø)
sentry-sidekiq	96.57% <ø> (ø)
sentry-resque	94.44% <ø> (ø)
sentry-delayed_job	94.68% <ø> (ø)
sentry-opentelemetry	99.31% <ø> (ø)

Files with missing lines	Coverage Δ
sentry-ruby/lib/sentry-ruby.rb	98.68% <ø> (-0.04%)	⬇️
sentry-ruby/lib/sentry/configuration.rb	98.20% <ø> (-0.02%)	⬇️
sentry-ruby/lib/sentry/cron/monitor_check_ins.rb	100.00% <100.00%> (ø)
sentry-ruby/lib/sentry/envelope/item.rb	94.59% <ø> (-0.15%)	⬇️
...y-ruby/lib/sentry/interfaces/stacktrace_builder.rb	100.00% <ø> (ø)
sentry-ruby/lib/sentry/transaction_event.rb	100.00% <ø> (ø)
sentry-ruby/lib/sentry/span.rb	97.22% <0.00%> (-1.06%)	⬇️

... and 1 file with indirect coverage changes

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