Copy reference in breadcrumb

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Background

Following up from 💬 Feedback: Issuable sidebar updates (#406603 - closed):

• Copy reference is currently located in dropdown
• Clicking the MR/issue number in the breadcrumb doesn't currently do anything (other than reload the page)

Proposal

This applies to merge requests, issues, epics, and incidents:

• Copy reference on breadcrumb click
• Remove option from dropdown

Option A --> Convert breadcrumb to a copy button

Pros

• No additional UI elements needed
• Converts something that wasn't very useful into something that serves a purpose

Cons

• Not particularly discoverable
• Clicking different parts of breadcrumb would do different things (ie link to a different page vs copying reference)

Option B --> Add copy icon button

Credit to @ldet:

Pros

• Discoverable
• Separate from actual breadcrumb link (which presumably would still reload the page as usual)

Cons

• Still have a somewhat useless link that reloads the page, always available
• Adds an additional UI element; might not be the direction we were planning on for the breadcrumb bar

Option C --> Convert current breadcrumb to dropdown

Default	On click

Pros

• Adds all items from dropdown to always-available breadcrumb bar
• Scales well- could be used for different actions depending on the page

Cons

• Not sure of current breadcrumb plan; is this possible?
• Potentially not discoverable