Update button ellipsis guidance with decision framework

See merge request !5283



Merged-by: Austin Regnery <aregnery@gitlab.com>
Approved-by: Pedro Moreira da Silva <hi@pedroms.com>
Approved-by: Chris Micek <cmicek@gitlab.com>
Approved-by: Austin Regnery <aregnery@gitlab.com>
Approved-by: Phillip Wells <pwells@gitlab.com>
Reviewed-by: Pedro Moreira da Silva <hi@pedroms.com>
Co-authored-by: Jeremy Elder <jelder@gitlab.com>

fix(GlBreadcrumb): Include clipboard button in collapse calculation

See merge request !5310



Merged-by: Vanessa Otto <votto@gitlab.com>
Approved-by: Vanessa Otto <votto@gitlab.com>
Reviewed-by: GitLab Duo <gitlab-duo@gitlab.com>
Co-authored-by: psjakubowska <psedlak-jakubowska@gitlab.com>