[ISSUE #4099]♻️Clean up existing clippy warnings of vec_init_then_push, redundant_closure and useless_conversion

[WaterWhisperer]

Which Issue(s) This PR Fixes(Closes)

#4087 Not complete yet
Fix #4099

Brief Description

Clean up existing clippy warnings of types:

• vec_init_then_push
• redundant_closure
• useless_conversion

How Did You Test This Change?

[rocketmq-rust-bot]

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[Copilot]

Pull Request Overview

This PR addresses Rust clippy warnings by cleaning up code patterns that are redundant or inefficient. The changes focus on removing unnecessary closures, eliminating redundant conversions, and replacing the vec-init-then-push pattern with direct vector initialization.

• Simplifies closures in benchmark functions by removing redundant wrapper closures
• Replaces vec initialization followed by multiple push operations with direct vec![] macro usage
• Removes unnecessary type conversions like PathBuf::from() and .into_iter()

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rocketmq-store/benches/delivery.rs	Simplified benchmark function closures
rocketmq-example/examples/consumer/pop_consumer.rs	Removed redundant .into_iter() call
rocketmq-client/examples/batch/simple_batch_producer.rs	Replaced vec initialization pattern with vec![] macro
rocketmq-client/examples/batch/callback_batch_producer.rs	Replaced vec initialization pattern with vec![] macro
rocketmq-broker/src/broker_path_config_helper.rs	Removed redundant PathBuf::from() conversion

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.56%. Comparing base (950bb02) to head (f490c4c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4097   +/-   ##
=======================================
  Coverage   26.56%   26.56%           
=======================================
  Files         575      575           
  Lines       81359    81359           
=======================================
  Hits        21609    21609           
  Misses      59750    59750           

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[rocketmq-rust-bot]

LGTM

[mxsm]

LGTM