Make dbcp2 testOnBorrow configurable

[suddendust]

Description

Adds configuration support for testOnBorrow in the Postgres connection pool with a default value of true. This ensures connections are validated before being borrowed from the pool, preventing stale or broken connections from being handed to the application.

Before this, default is false

  /**
     * The default value for the {@code testOnBorrow} configuration attribute.
     * @see GenericObjectPool#getTestOnBorrow()
     * @see GenericKeyedObjectPool#getTestOnBorrow()
     */
    public static final boolean DEFAULT_TEST_ON_BORROW = false;

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.44%. Comparing base (35f7620) to head (25b3f59).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #313   +/-   ##
=========================================
  Coverage     81.43%   81.44%           
- Complexity     1549     1550    +1     
=========================================
  Files           242      242           
  Lines          7514     7517    +3     
  Branches        726      726           
=========================================
+ Hits           6119     6122    +3     
  Misses          943      943           
  Partials        452      452           

Flag	Coverage Δ
integration	81.44% <100.00%> (+<0.01%)	⬆️
unit	55.52% <100.00%> (+0.01%)	⬆️

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[github-actions]

Test Results

  124 files  ±0    124 suites  ±0   38s ⏱️ -1s
  840 tests ±0    839 ✅ ±0  1 💤 ±0  0 ❌ ±0 
1 176 runs  ±0  1 175 ✅ ±0  1 💤 ±0  0 ❌ ±0 

Results for commit 25b3f59. ± Comparison against base commit 35f7620.

♻️ This comment has been updated with latest results.

[puneet-traceable]

Curious: How is the borrow tested? Some ping like query?