[ISSUE #9705] Improve persist() method reliability to prevent broker startup failure after power outages

[guyinyou]

• Add atomic file backup mechanism in persist() methods
• Delete corrupted config files during startup to avoid bak file pollution
• Add directory sync to ensure file operations visibility

Fixes: TimerMetrics#persist, TransactionMetrics#persist, ConfigManager#persist

Which Issue(s) This PR Fixes

Fixes #9705

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 60.00000% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.12%. Comparing base (73e8fdb) to head (172f06f).
⚠️ Report is 179 commits behind head on develop.

Files with missing lines	Patch %	Lines
...java/org/apache/rocketmq/common/ConfigManager.java	41.66%	12 Missing and 2 partials ⚠️
...ocketmq/broker/transaction/TransactionMetrics.java	61.11%	5 Missing and 2 partials ⚠️
.../org/apache/rocketmq/store/timer/TimerMetrics.java	78.26%	4 Missing and 1 partial ⚠️
...c/main/java/org/apache/rocketmq/common/MixAll.java	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9706      +/-   ##
=============================================
- Coverage      48.22%   48.12%   -0.11%     
+ Complexity     12167    12139      -28     
=============================================
  Files           1313     1313              
  Lines          93238    93233       -5     
  Branches       11950    11944       -6     
=============================================
- Hits           44966    44866     -100     
- Misses         42708    42793      +85     
- Partials        5564     5574      +10     

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[fuyou001]

LGTM