[devcontainer] switch to /workspace/sentry

[solnic]

This is less confusing otherwise we had:

/workspace/sentry-ruby/sentry-ruby

Which looked bad and was a bit harder to work with.

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.03%. Comparing base (213558f) to head (023bba7).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2645      +/-   ##
==========================================
+ Coverage   93.68%   97.03%   +3.34%     
==========================================
  Files         133      133              
  Lines        5101     5128      +27     
==========================================
+ Hits         4779     4976     +197     
+ Misses        322      152     -170     

Components	Coverage Δ
sentry-ruby	97.63% <ø> (+4.26%)	⬆️
sentry-rails	94.91% <ø> (+1.49%)	⬆️
sentry-sidekiq	94.29% <ø> (-1.15%)	⬇️
sentry-resque	94.44% <ø> (ø)
sentry-delayed_job	94.68% <ø> (ø)
sentry-opentelemetry	98.62% <ø> (-0.69%)	⬇️

see 32 files with indirect coverage changes

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