Breadcrumbs: Only dedupe breacrumb items for matching node names

[gillesdemey]

What is this feature?

This PR is a follow-up to #75218 but changes the logic to only de-duplicate breadcrumb items when both the base URL and the node names match.

Why do we need this feature?

The new alerting detail page (WIP) injects two additional breadcrumbs when viewing the details for a particular alert.

A namespace and the group breadcrumb are added; and we'd like both of them to navigate to the alert rules list view but with some search filters applied.

The breadcrumb would roughly look like Alerting > My Namespace > My group > My alert rule.

My Namespace would go to /alerting/list?query=namespace:"my+namespace"
My Group would go to /alerting/list?query=namespace:"my+namespace"+group="my+group"

Both breadcrumb items share the same base path, which currently triggers de-duplication logic in the breadcrumb component.

grafana/public/app/core/components/Breadcrumbs/utils.ts

Lines 35 to 42 in 4a3c148

	const isSamePathAsLastBreadcrumb = urlToMatch.length > 0 && lastPath === urlToMatch;
	// Remember this path for the next breadcrumb
	lastPath = urlToMatch;
	if (!node.hideFromBreadcrumbs && !isSamePathAsLastBreadcrumb) {
	crumbs.unshift({ text: node.text, href: node.url ?? '' });
	}

This PR adds an additional requirement for both the current and the parent breadcrumb item to also share the same text.

Special notes for your reviewer:

This is a proposed change to the breadcrumbs de-dupe logic, feel free to discuss alternatives :)

[ashharrison90]

lgtm 👍 let's get this in to unblock