Allow more than 3 additional properties in Internal Events

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/159067



Merged-by: Gary Holtz <gholtz@gitlab.com>
Approved-by: Nao Hashizume <nhashizume@gitlab.com>
Approved-by: Gary Holtz <gholtz@gitlab.com>
Reviewed-by: Michał Wielich <mwielich@gitlab.com>
Co-authored-by: Niko Belokolodov <nbelokolodov@gitlab.com>