Add io.openliberty.before.checkpoint condition

[tjwatson]

This condition gets registered by the kernel when
a checkpoint has been requested and is unregistered just before entering single-threaded mode in the JVM to prepare for the checkpoint.

• 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".

[tjwatson]

#build

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[dazavala]

LGTM! Thanks, @tjwatson

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[tjwatson]

#build

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[tjwatson]

#build

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[dazavala]

#libby

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Code analysis and actions

DO NOT DELETE THIS COMMENT.

• 2 product code files were changed.

• Please describe in a separate comment how you tested your changes.

• 4 FAT files were changed, added, or removed.

• Check that the build did not break the affected FAT suite(s).

[dazavala]

Attn: @tjwatson