migrate distributed tracing flags off experimental prefix

[omerap12]

Fixes: #19050
Move distributed tracing related flags:

• experimental-enable-distributed-tracing
• experimental-distributed-tracing-address
• experimental-distributed-tracing-service-name
• experimental-distributed-tracing-instance-id
• experimental-distributed-tracing-sampling-rate

The experimental flags are marked as deprecated and will be decommissioned in v3.7.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

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[k8s-ci-robot]

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