Remove obsolete usage-examples

[taylor-swanson]

Removed obsolete usage-example directory which no longer reflects how ECS is generated.

• Have you signed the contributor license agreement? y
• Have you followed the contributor guidelines? y
• For proposing substantial changes or additions to the schema, have you reviewed the RFC process? n/a
• If submitting code/script changes, have you verified all tests pass locally using make test? n/a
• If submitting schema/fields updates, have you generated new artifacts by running make and committed those changes? n/a
• Is your pull request against main? Unless there is a good reason otherwise, we prefer pull requests against main and will backport as needed. n/a
• Have you added an entry to the CHANGELOG.next.md? n/a

Related

• Closes elastic/integration-experience#137

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