fix: middleware reorder

[xianml]

What does this PR address?

the proper order of middleware is

1. TrafficMetrics middleware
2. OpenTelemetry middleware
3. AccessLog middleware
4. TimeoutMiddleware
5. MaxConcurrencyMiddleware
6. CORS middleware
7. ContextMiddleware

LOG

Metric

Fixes #(issue)

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[frostming]

1. TrafficMetrics middleware

Is this redundant?

[xianml]

1. TrafficMetrics

1. TrafficMetrics middleware

Is this redundant?

only 1 TrafficMetrics middleware. Why redundant?

[frostming]

only 1 TrafficMetrics middleware. Why redundant?

Okay, I mistook it.

[github-actions]

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