Migrate examples to tests_e2e directory structure

- Relocated all files and scripts from `examples` to `tests_e2e` for better organization.
- Updated references and paths in configurations, scripts, and test files.
- Adjusted `bump-version.sh` to handle the new `tests_e2e` structure.
- Updated `.gitignore` to reflect path changes.

examples/fixtures/header-echo/README.md

@@ -1,66 +0,0 @@
-# Header Echo Server - Test Fixture
-
-A lightweight Python HTTP server that echoes all request headers as JSON. Used for testing HAProxy plugins that manipulate headers and client IPs.
-
-## Purpose
-
-This test fixture is used by both Docker Compose and Kubernetes test suites to verify:
-- Header manipulation (e.g., X-Forwarded-For, CF-Connecting-IP)
-- IP restoration plugins (Cloudflare, custom CDN integrations)
-- Request routing and backend visibility
-
-## Usage
-
-### Docker Compose
-```yaml
-services:
-  webapp:
-    build: ../fixtures/header-echo
-    ports:
-      - "8080:8080"
-```
-
-### Kubernetes
-```bash
-# Build and load into kind cluster
-docker build -t header-echo-server:test .
-kind load docker-image header-echo-server:test --name your-cluster
-
-# Use in deployment
-spec:
-  containers:
-  - name: webapp
-    image: header-echo-server:test
-    imagePullPolicy: Never
-```
-
-### Manual Testing
-```bash
-# Start the server
-python3 server.py
-
-# Test it
-curl http://localhost:8080
-# Returns JSON with all headers, client IP, and X-Forwarded-For value
-```
-
-## Response Format
-
-```json
-{
-  "headers": {
-    "Host": "localhost:8080",
-    "User-Agent": "curl/7.81.0",
-    "Accept": "*/*"
-  },
-  "client_ip": "127.0.0.1",
-  "x_forwarded_for": "NOT SET"
-}
-```
-
-## Used By
-
-- `examples/docker/docker-compose-cloudflare.yml`
-- `examples/docker/test_docker_compose.py::TestCloudflare`
-- `examples/kubernetes/cloudflare.yml`
-- `examples/kubernetes/test_kubernetes.py::TestCloudflare`