Display tooltips on work item breadcrumbs to improve wayfinding and educate on group hierarchy

Challenge

It isn't inherently obvious if the user is in a group, subgroup, or project just by viewing the breadcrumbs with a work item like an issue, epic, or MR. The symbol and number indicating the work item number and type could also use better reenforcement as to what the object is.

Proposal

Update Group, Sub-group, Project and Work item number breadcrumbs across GitLab:

• Add a tooltip to the Group breadcrumb: "Group name group"
• Add a tooltip to the Sub-group breadcrumb: "Sub-group name sub-group"
• Add a tooltip to the Project breadcrumb: "Project name project"
• Add a tooltip to the Work item number breadcrumb: "Work item title"

We should also update the tooltip appearing in the left navigation to reenforce whether the user is in a group, sub-group, or project.

• Add a tooltip to the Group navigation item: "Group name group"
• Add a tooltip to the Sub-group navigation item:: "Sub-group name sub-group"
• Add a tooltip to the Project navigation item:: "Project name project"

For example, an issue could look like this: