[ISSUE #10808] Tolerate proxy delay level whitespace

[Aias00]

What

• Parse Proxy messageDelayLevel with trimmed \s+ tokens instead of splitting only on a single space.
• Fall back to the default delay level config when the value is blank, so useDelayLevel does not later read an empty table.
• Add ProxyConfigTest coverage for repeated whitespace and blank config values.

Why

messageDelayLevel is a config-file value. Repeated spaces, tabs, newlines, or blank input should not leave Proxy delay-level parsing partially populated or empty.

Validation

• JAVA_HOME=$(/usr/libexec/java_home -v 1.8) mvn -pl proxy -DskipITs -DskipCheckStyle -Dtest=ProxyConfigTest test
• git diff --check

Closes #10808

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.23%. Comparing base (eddb235) to head (6120da7).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #10809      +/-   ##
=============================================
- Coverage      48.33%   48.23%   -0.10%     
+ Complexity     13524    13493      -31     
=============================================
  Files           1380     1380              
  Lines         101104   101107       +3     
  Branches       13107    13108       +1     
=============================================
- Hits           48864    48769      -95     
- Misses         46281    46359      +78     
- Partials        5959     5979      +20     

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