Add create issue button to metrics page

What does this MR do and why?

Add create issue button to metrics page

• Pass new issue path to metrics details view model
• Add Create Issue button to metrics details heading
• Build and inject observability_metric_details into URL param

backend changes: !161329 (merged)

Close Add create issue button to metrics page (gitlab-org/opstrace/opstrace#2887 - closed)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

How to set up and validate locally

• Make sure you are logged in and running GDK with Ultimate license
• Enable :observability_features
• Apply patch to load local mocks:

git apply < <(curl -s https://gitlab.com/-/snippets/3725609/raw/main/mock.patch)

• Apply patch to load diff from backend MR !161329 (merged) if not merged

git apply < <(curl -s https://gitlab.com/gitlab-org/gitlab/-/merge_requests/161329.diff)

• Go to http://gdk.test:3443/flightjs/Flight/-/metrics/app.ads.ad_requests?type=Sum