feat(core): Emit no_parent_span client outcomes for discarded spans requiring a parent#20350

Lms24 wants to merge 4 commits intodevelopgetsentry/sentry-javascript:developfrom

lms/feat-record-no_parent_span-client-outcomegetsentry/sentry-javascript:lms/feat-record-no_parent_span-client-outcomeCopy head branch name to clipboard