Update long check interval FAT tests to use traces for startup interv…

[Channyboy]

…al test for more exact timing and a more direct approach in resoving interval time for long interval test

• 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".

################################################################################################

[Channyboy]

#build (view Open Liberty Personal Build - ⏳InProgress)

Note: Target locations of links might be accessible only to IBM employees.

Cancelled

[Channyboy]

!build
(view Open Liberty Personal Build - ⏳InProgress)
spawn.fullfat.buckets=io.openliberty.microprofile.health.file.healthcheck.longinterval_fat

Note: Target locations of links might be accessible only to IBM employees.

[LibbyBot]

Code analysis and actions

DO NOT DELETE THIS COMMENT.

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

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

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

[wraschke]

Hi, please ignore this comment.