[Enhancement] Merge enableRunningFlagsInFlush and isWriteWithoutMmap configurations

[guyinyou]

Before Creating the Enhancement Request

• [x] I have confirmed that this should be classified as an enhancement rather than a bug/feature.

Summary

Merge the enableRunningFlagsInFlush and isWriteWithoutMmap configuration options into a single isWriteWithoutMmap configuration to simplify configuration management and reduce the chance of misconfiguration.

Motivation

Currently, RocketMQ has two related configuration options: enableRunningFlagsInFlush: Controls whether to use runningFlags when flushing data to disk isWriteWithoutMmap: Controls whether to use RandomAccessFile instead of MappedByteBuffer for writing These two configurations are typically used together and need to be enabled/disabled simultaneously. Having them as separate configurations creates several issues: Configuration Complexity: Users need to manage two separate but related settings Misconfiguration Risk: It's easy to set one without the other, leading to unexpected behavior Maintenance Overhead: Code needs to check both configurations in multiple places User Confusion: The relationship between these two settings is not immediately clear By merging them into a single configuration, we can simplify the user experience and reduce the potential for configuration errors.

Describe the Solution You'd Like

Merge enableRunningFlagsInFlush into isWriteWithoutMmap with the following behavior: When isWriteWithoutMmap = true: Use RandomAccessFile instead of MappedByteBuffer for writing Set runningFlags to null during MappedFileQueue and MappedFile initialization to avoid conflicts with non-mmap operations When isWriteWithoutMmap = false: Use MappedByteBuffer for writing Use normal runningFlags behavior

Describe Alternatives You've Considered

N/A

Additional Context

No response