Stop shipping commons-lang3

[basil]

#8971 inadvertently began bundling commons-lang3 in the WAR, something we do not want to do because we do not want to increase core's API surface area. Instead we prefer to rely on a library plugin to deliver this to consumers in the Jenkins plugin ecosystem. This library is only used in org.apache.commons.compress.harmony.unpack200.Pack200UnpackerAdapter, which we don't use anyway, so we can simply exclude commons-lang3 without any negative effects. See also apache/commons-compress#489.

Testing done

Built Jenkins and verified the WAR no longer contains commons-lang3.

Proposed changelog entries

N/A

Proposed upgrade guidelines

N/A

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1. The Jira issue, if it exists, is well-described.
2. The changelog entries and upgrade guidelines are appropriate for the audience affected by the change (users or developers, depending on the change) and are in the imperative mood (see examples). Fill in the Proposed upgrade guidelines section only if there are breaking changes or changes that may require extra steps from users during upgrade.
3. There is automated testing or an explanation as to why this change has no tests.
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7. For dependency updates, there are links to external changelogs and, if possible, full differentials.
8. For new APIs and extension points, there is a link to at least one consumer.

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@mention

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3. Changelog entries in the pull request title and/or Proposed changelog entries are accurate, human-readable, and in the imperative mood.
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[timja]

/label ready-for-merge

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This PR is now ready for merge, after ~24 hours, we will merge it if there's no negative feedback.

Thanks!

[basil]

COMPRESS-669 FTR