[Time Capsule - DON'T OPEN BEFORE NOV 6 2025] Emit debugId instead of debug_id

[lforst]

For historical reasons Sentry CLI emits debug_id as a field in debug ID injection. As per spec it should actually be debugId, HOWEVER, we wanted to give ourselves and more importantly Sentry Self-Hosted versions to catch up to be able to process debugId fields before we change what Sentry CLI emits.

See this issue as a task to do a major version and emit debugId instead of debug_id.

Actual Time Capsule Content because it is funny

• Donald Trump was just elected President a second time
• It is 9°C in Vienna right now
• People are moving to Bluesky and I have 119 followers
• Cramer is on sabbatical
• We are starting to work on v9 of the JS SDK
• The JS SDK team is 7 people right now
• Mobile team moved upstairs
• We do not yet have span streaming
• I do not yet have my own company
• Debug ID proposal is at Stage 1
• I am currently doing a masters degree