Add issue prefilling support for o11y tracing

What does this MR do and why?

Add issue prefilling support for o11y tracing

• Add support for accepting observability_trace_details params ( these will be automatically generated by the UI gitlab-org/opstrace/opstrace#2895 (closed))
• Add TracingIssuesHelper to handle tracing related issues prefilling
• Add specs

Sample URL:

http://gdk.test:3443/flightjs/Flight/-/issues/new?observability_trace_details=%7B%22fullUrl%22%3A%22http%3A%2F%2Fgdk.test%3A3443%2Fflightjs%2FFlight%2F-%2Ftracing%2Fcd4cfff9-295b-f014-595c-1be1fc145822%22%2C%22name%22%3A%22frontend-proxy%20%3A%20ingress%22%2C%22traceId%22%3A%228335ed4c-c943-aeaa-7851-2b9af6c5d3b8%22%2C%22start%22%3A%22Thu%2C%2004%20Jul%202024%2014%3A44%3A21%20GMT%22%2C%22duration%22%3A%222.27ms%22%2C%22totalSpans%22%3A3%2C%22totalErrors%22%3A0%7D

Close Automatically fill issue title and description ... (gitlab-org/opstrace/opstrace#2893 - 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

1. You need a GitLab Ultimate license.
2. Enable the :observability_features feature flag.
3. Apply patch to load local mocks git apply < <(curl -s https://gitlab.com/-/snippets/3725609/raw/main/mock.patch)
4. Create a new issue within a project with observability_trace_details params, e.g. http://gdk.test:3443/flightjs/Flight/-/issues/new?observability_trace_details=%7B%22fullUrl%22%3A%22http%3A%2F%2Fgdk.test%3A3443%2Fflightjs%2FFlight%2F-%2Ftracing%2Fcd4cfff9-295b-f014-595c-1be1fc145822%22%2C%22name%22%3A%22frontend-proxy%20%3A%20ingress%22%2C%22traceId%22%3A%228335ed4c-c943-aeaa-7851-2b9af6c5d3b8%22%2C%22start%22%3A%22Thu%2C%2004%20Jul%202024%2014%3A44%3A21%20GMT%22%2C%22duration%22%3A%222.27ms%22%2C%22totalSpans%22%3A3%2C%22totalErrors%22%3A0%7D