Don't use array for transaction names and sources on scope

[sl0thentr0py]

closes #2257

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.66%. Comparing base (cfc2570) to head (55e87b8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2324      +/-   ##
==========================================
- Coverage   98.68%   98.66%   -0.02%     
==========================================
  Files         205      205              
  Lines       13486    13481       -5     
==========================================
- Hits        13308    13301       -7     
- Misses        178      180       +2     

Components	Coverage Δ
sentry-ruby	99.03% <100.00%> (-0.02%)	⬇️
sentry-rails	97.41% <ø> (ø)
sentry-sidekiq	97.01% <ø> (ø)
sentry-resque	96.79% <ø> (-0.33%)	⬇️
sentry-delayed_job	98.92% <ø> (ø)
sentry-opentelemetry	100.00% <ø> (ø)

Files	Coverage Δ
sentry-ruby/lib/sentry/scope.rb	100.00% <100.00%> (ø)
...y-ruby/spec/sentry/rack/capture_exceptions_spec.rb	100.00% <100.00%> (ø)
sentry-ruby/spec/sentry/scope/setters_spec.rb	97.58% <100.00%> (ø)
sentry-ruby/spec/sentry/scope_spec.rb	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes