Release detector: Use full SHA hash in default release name

[natikgadzhi]

Summary

This pull request makes it so Sentry-Ruby will name releases by their full SHA commit hash instead of the short version.

• Aligns with how sentry-cli does that
• Aligns with Python SDK: Question about automatic release detection sentry-python#908
• Closes Automatic release detection naming conflict with Github Action #2114

/cc @sl0thentr0py and @stephanie-anderson

[codecov]

Codecov Report

Merging #2174 (dbc5f3f) into master (c7c8e5b) will decrease coverage by 0.03%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2174      +/-   ##
==========================================
- Coverage   97.40%   97.37%   -0.03%     
==========================================
  Files          98       98              
  Lines        3655     3655              
==========================================
- Hits         3560     3559       -1     
- Misses         95       96       +1     

Components	Coverage Δ
sentry-ruby	98.02% <100.00%> (ø)
sentry-rails	94.98% <ø> (ø)
sentry-sidekiq	95.54% <ø> (ø)
sentry-resque	92.06% <ø> (-1.59%)	⬇️
sentry-delayed_job	94.36% <ø> (ø)
sentry-opentelemetry	100.00% <ø> (ø)

Files	Coverage Δ
sentry-ruby/lib/sentry/release_detector.rb	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

[sl0thentr0py]

thx