[ISSUE #8096]♻️Replace legacy logger setup in root examples

[mxsm]

Which Issue(s) This PR Fixes(Closes)

• Fixes [Refactor♻️] Replace legacy logger setup in root examples #8096

Brief Description

This PR removes legacy logger bootstrap patterns from root workspace examples and routes them through the unified telemetry bootstrap.

Changes include:

• Replace rocketmq_common::log::init_logger in root workspace client examples with rocketmq_observability::install_global.
• Replace direct tracing_subscriber setup in controller and scheduler examples with the unified bootstrap.
• Keep a telemetry runtime guard alive until normal example completion and explicitly shut it down.
• Switch the rocketmq-rust example dev dependency from tracing-subscriber to rocketmq-observability.
• Keep standalone rocketmq-example untouched because it is a separate project with its own validation boundary.

How Did You Test This Change?

• cargo fmt --all passed.
• cargo test -p rocketmq-rust --examples --all-features passed.
• cargo test -p rocketmq-client-rust --examples --all-features passed.
• cargo test -p rocketmq-controller --examples --all-features passed.
• cargo clippy --workspace --no-deps --all-targets --all-features -- -D warnings passed.

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Review details

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Run ID: 22a87c1e-a868-49a4-8ff0-7f3c3990c9d1

📥 Commits

Reviewing files that changed from the base of the PR and between e799062 and 5e23b53.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (18)

• rocketmq-client/examples/batch/callback_batch_producer.rs
• rocketmq-client/examples/batch/simple_batch_producer.rs
• rocketmq-client/examples/broadcast/push_consumer.rs
• rocketmq-client/examples/consumer/pop_consumer.rs
• rocketmq-client/examples/ordermessage/ordermessage_consumer.rs
• rocketmq-client/examples/ordermessage/ordermessage_producer.rs
• rocketmq-client/examples/quickstart/consumer.rs
• rocketmq-client/examples/quickstart/producer.rs
• rocketmq-client/examples/rpc/request_callback_producer.rs
• rocketmq-client/examples/rpc/request_producer.rs
• rocketmq-client/examples/transaction/transaction_producer.rs
• rocketmq-controller/examples/controller_manager_basic.rs
• rocketmq-controller/examples/controller_manager_cluster.rs
• rocketmq-controller/examples/three_node_cluster.rs
• rocketmq/Cargo.toml
• rocketmq/examples/advanced_usage.rs
• rocketmq/examples/basic_usage.rs
• rocketmq/examples/basic_usage_more.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch mxsm/root-examples-telemetry-bootstrap

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[rocketmq-rust-bot]

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