Consolidate classic api persistent deliveryDelay tests

[sakerl]

• [ x] I have considered the risk of behavior change or other zero migration impact (https://github.com/OpenLiberty/open-liberty/wiki/Behavior-Changes).
• If this PR fixes an Issue, the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN" (verify release bug label if applicable: https://github.com/OpenLiberty/open-liberty/wiki/Open-Liberty-Conventions).
• If this PR resolves an external Known Issue (including APARS), the description includes "Fixes #FILLMEIN" or "Resolves #FILLMEIN".

Consolidate the persistent deliveryDelay ClassicAPI tests in the same way as was done for the equivalent simplifiedAPI tests in PRs:
#30229
#30249

[LibbyBot]

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