Scheduler: introduce a shared CronParser util class #1789

Job	Run time
Attach pull request number	0s
Initial JDK 17 Build	12m 35s
CI Sanity Check	31s
Calculate Test Jobs	9s
Maven Tests - JDK 17	7m 25s
JVM Tests - JDK 17	12m 52s
Maven Tests - JDK 17 Windows	11m 23s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
JVM Tests - JDK 21	12m 59s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
JVM Tests - JDK 17 Windows	19m 40s
Quickstarts Compilation - JDK 17	6m 16s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
Native Tests - Main	7m 40s
Native Tests - HTTP	7m 26s
MicroProfile TCKs Tests	0s
Native Tests - Misc1	7m 20s
Native Tests - Virtual Thread - Main	6m 28s
Native Tests - Spring	6m 21s
Upload build stats to collector	0s
Build report	29s
	1h 59m 34s

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