Do not associate vendor connection pool metrics with an application for mpMetrics-5.x

[Channyboy]

• 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".

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[Channyboy]

#build (view Open Liberty Personal Build - ✅ completed successfully!)

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[LibbyBot]

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[LibbyBot]

Code analysis and actions

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[pgunapal]

LGTM