repo: mandatory issue templates (AIDM-425)

[tlhunter]

What does this PR do?

• repurposes the freeform issue templates to versions with UI elements
• makes issue templates mandatory
• links to helpdesk pages

Motivation

• standardizes the create issue experience across tracers
• see the node.js create issue screen for an example of how this will look

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.
• For internal contributors, a matching PR should be created to the v2-dev branch and reviewed by @DataDog/apm-go.

Unsure? Have a question? Request a review!

[datadog-datadog-prod-us1]

Datadog Report

Branch report: tlhunter/create-issue-standard
Commit report: 930d96b
Test service: dd-trace-go

✅ 0 Failed, 5117 Passed, 70 Skipped, 2m 34.9s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-12-20 21:56:50

Comparing candidate commit 4b9d682 in PR branch tlhunter/create-issue-standard with baseline commit d15e61a in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 59 metrics, 0 unstable metrics.