Global log attributes are not merged with per-log attributes when capturing structured logs

[tustanivsky]

When using structured logging with both global attributes (set via sentry_set_attribute()) and per-log attributes (passed to sentry_log_*() functions), the global attributes are not included in the captured log and only the per-log attributes appear.

Expected Behavior:
Global attributes should be merged with per-log attributes when capturing a log entry.

Actual Behavior:
When per-log attributes are provided, global attributes are completely ignored/overwritten.

Related items:

• Add category as attribute to structured logs sentry-unreal#1199

[linear]

NATIVE-159