Fix bug in DataNode startup process

[CRZbulabula]

We should preserve system.properties immediately after registered from ConfigNode.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 38.70%. Comparing base (2ae06e8) to head (682ae9d).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ain/java/org/apache/iotdb/db/service/DataNode.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #16610      +/-   ##
============================================
- Coverage     38.70%   38.70%   -0.01%     
  Complexity      207      207              
============================================
  Files          4940     4940              
  Lines        327263   327263              
  Branches      41569    41569              
============================================
- Hits         126677   126657      -20     
- Misses       200586   200606      +20     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.