Update workshops to GraalVM 25. #39
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This PR:
Upgrades workshops to GraalVM 25
Adds copyright and UPL licence headers to Java source files
Updates Oracle GraalVM container images versions
Updates Native Build Tools version
Removes the step enabling SkipFlow optimization with Native Image in some workshops (starting from GraalVM 25 it is enabled by default)
What is left:
If yes, replace gcr.io/distroless/java21-debian12 with gcr.io/distroless/java25-debian12 in Dockerfiles and READMEs (where mentioned). Search for “java21-debian12”.