Read testOnBorrow correctly from config

[suddendust]

Description

There was a bug in the earlier PR that it was not reading this key from the config. This PR fixes it. Test this in a live env:

2026-07-02 07:44:50.032 [main] DEBUG o.h.c.d.p.PostgresConnectionPool - Postgres connection pool properties - maxTotal: 10, maxIdle: 2, minIdle: 1, maxWaitMillis: 10000, connectionSurrenderTimeout: PT5M, testOnBorrow: false

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.44%. Comparing base (7c419db) to head (ae0ddf9).

Files with missing lines	Patch %	Lines
...config/TypesafeConfigDatastoreConfigExtractor.java	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #316      +/-   ##
============================================
- Coverage     81.44%   81.44%   -0.01%     
- Complexity     1550     1552       +2     
============================================
  Files           242      242              
  Lines          7519     7524       +5     
  Branches        727      728       +1     
============================================
+ Hits           6124     6128       +4     
  Misses          943      943              
- Partials        452      453       +1     

Flag	Coverage Δ
integration	81.44% <80.00%> (-0.01%)	⬇️
unit	55.54% <80.00%> (+0.01%)	⬆️

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[github-actions]

Test Results

  124 files  ±0    124 suites  ±0   41s ⏱️ +5s
  842 tests +2    841 ✅ +2  1 💤 ±0  0 ❌ ±0 
1 179 runs  +2  1 178 ✅ +2  1 💤 ±0  0 ❌ ±0 

Results for commit ae0ddf9. ± Comparison against base commit 7c419db.

♻️ This comment has been updated with latest results.