Set the default value of testWhileIdle to false to prevent Error Log

[linghengqian]

• Set the default value of testWhileIdle to false to prevent Error Log.
• Fixes dynamic-datasource-spring-boot-starter兼容性问题  #6076.
• Also fixes So what will cause ”testWhileIdle is true, validationQuery not set“ ？ #1497.
• This is an extension of the investigation of connection disabled when use com.alibaba.druid.pool.DruidDataSource apache/shardingsphere#32765 . When testWhileIdle is true, validationQuery is always required. The validationQuery of each database is different, which results in the default value of validationQuery can only be empty.
• This will resolve the following Error Log.

2024-09-11T18:01:52.245+08:00 ERROR 15152 --- [           main] com.alibaba.druid.pool.DruidDataSource   : testWhileIdle is true, validationQuery not set

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.14%. Comparing base (015a80f) to head (c392dbe).
Report is 8 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6128      +/-   ##
============================================
+ Coverage     59.11%   59.14%   +0.02%     
- Complexity    28974    29047      +73     
============================================
  Files          1419     1429      +10     
  Lines        132679   133000     +321     
  Branches      24654    24694      +40     
============================================
+ Hits          78433    78658     +225     
- Misses        44302    44362      +60     
- Partials       9944     9980      +36     

Files with missing lines	Coverage Δ
...om/alibaba/druid/pool/DruidAbstractDataSource.java	78.08% <ø> (-0.39%)	⬇️

... and 20 files with indirect coverage changes

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