feat(mappings): urlPathPattern is added

[imcvampire]

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This PR adds a new/missing parameter urlPathPattern for Mapping resource.

References

https://wiremock.org/docs/request-matching/#regex-matching-on-the-path-only

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• [x] The PR title represents the desired changelog entry
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• [x] Test coverage that demonstrates that the change works as expected
• [x] For new features, there's necessary documentation in this pull request or in a subsequent PR to wiremock.org