Merge branch 'rossetd/migrated-from-deprecated-camel-case' into 'master'

Fix camelCase vs snake_case inconsistencies when accessing traces

Closes gitlab-org/opstrace/opstrace#2430 and gitlab-org/opstrace/opstrace#2463

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/136869



Merged-by: Illya Klymov <xanf@xanf.me>
Approved-by: Serhii Yarynovskyi <syarynovskyi@gitlab.com>
Approved-by: Illya Klymov <xanf@xanf.me>
Co-authored-by: Daniele Rossetti <drossetti@gitlab.com>