chore: fix FQCN in AggregateProcessorTest

[gnodet]

Summary

• Fix fully-qualified java.util.concurrent.TimeUnit.SECONDS usage in AggregateProcessorTest — add proper import and use simple class name instead.
• This was introduced in commit 9e5c829 (CAMEL-22539) and causes CI failure in the "Fail if there are uncommitted changes" step because the OpenRewrite FQCN-shortening plugin rewrites it during the build.

Test plan

• mvn compile test-compile -pl core/camel-core passes
• CI "uncommitted changes" check passes

[github-actions]

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[gnodet]

The CAMEL-22539 PR (#23024) was created and CI-tested before the OpenRewrite FQCN enforcement (#22935) was merged. Its CI passed because the rewrite rule wasn't active yet. When it was subsequently merged into main — which now includes the OpenRewrite plugin — the build rewrites the inline java.util.concurrent.TimeUnit.SECONDS to use a proper import, producing an uncommitted diff that fails the "Fail if there are uncommitted changes" CI check.

Claude Code on behalf of Guillaume Nodet

[gnodet]

Duplicated by #23036

[github-actions]

🧪 CI tested the following changed modules:

• core/camel-core

⚠️ Some tests are disabled on GitHub Actions (@DisabledIfSystemProperty(named = "ci.env.name")) and require manual verification:

• core/camel-core: 2 test(s) disabled on GitHub Actions

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