Update issue templates with testing template

Add testing template

Author: crivetimihai

.github/ISSUE_TEMPLATE/testing--bug--unit--manual--or-new-test-.md

@@ -0,0 +1,82 @@
+---
+name: Testing (bug, unit, manual. or new test)
+about: Add or improve unit tests, integration tests, or perform manual testing
+title: "[Test]: "
+labels: testing, triage
+assignees: ''
+
+---
+
+### ✅ Test Summary
+Briefly describe what needs to be tested or validated.
+
+---
+
+### 🧪 Test Type
+Choose one or more applicable categories:
+
+- [ ] Unit tests (Python)
+- [ ] Integration / end-to-end tests
+- [ ] Manual UI testing (admin panel)
+- [ ] Transport coverage (HTTP, WebSocket, SSE, stdio)
+- [ ] Federation / multi-gateway testing
+- [ ] Configuration / environment-specific behavior
+- [ ] Other (explain below)
+
+---
+
+### 🧬 Scope & Affected Components
+Select what this test covers or validates:
+
+- [ ] `mcpgateway` core (API logic, handlers)
+- [ ] Admin UI (HTMX / Alpine / Tailwind)
+- [ ] Tool/Resource/Prompt logic
+- [ ] Federation sync/discovery
+- [ ] Server interactions or SSE
+- [ ] Auth / JWT / security flows
+- [ ] Observability (logging, metrics)
+- [ ] Makefile, shell scripts or CLI
+- [ ] Containerized setup (Docker/Podman)
+- [ ] Other (explain below)
+
+---
+
+### 📋 Acceptance Criteria
+What should pass or be verified?
+
+- [ ] All relevant assertions are covered
+- [ ] No side-effects or regressions observed
+- [ ] Confirmed in multiple environments (if needed)
+- [ ] Edge cases and error handling tested
+- [ ] Logs and output are clean and expected
+
+---
+
+### 📓 Notes & Steps
+Include commands, expected behaviors, or test strategy.
+
+```bash
+# Example: run coverage locally
+make test coverage
+pytest tests/test_example.py
+```
+
+---
+
+### 🧠 Environment Info (if manual testing)
+
+| Key              | Value                        |
+| ---------------- | ---------------------------- |
+| Gateway version  | `e.g. main@a1b2c3d`          |
+| Python version   | `e.g. 3.11`                  |
+| Transport tested | `http`, `ws`, `sse`, `stdio` |
+| OS / Platform    | `e.g. macOS, Ubuntu`         |
+| Container        | `e.g. Docker, Podman, none`  |
+
+> If applicable (ex: new type of test) add information on how to set this up using CI/CD with GitHub Actions or contribute directly to the workflow in `.github/workflows`
+
+---
+
+### 📎 Related PRs / Issues (optional)
+
+Link any relevant work.