chore: migrate Kibana functional tests to use YAML test definition format

[JoshMock]

Migrates Kibana functional tests to use the same YAML test definition format as elasticsearch-clients-tests. This will make it easier to add more Kibana test definitions and increase functional test coverage of Kibana APIs.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ BASH	shellcheck	3		0	0	0.43s
✅ COPYPASTE	jscpd	yes		no	no	0.57s
✅ REPOSITORY	gitleaks	yes		no	no	60.33s
✅ REPOSITORY	git_diff	yes		no	no	0.12s
✅ REPOSITORY	secretlint	yes		no	no	11.61s
✅ REPOSITORY	trivy	yes		no	no	26.72s
✅ TYPESCRIPT	eslint	20		0	0	6.02s
✅ YAML	yamllint	587		0	0	6.31s

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[JoshMock]

Worth noting that a LOT of tests are currently skipped. I found and fixed a few bugs along the way here, but I'm going to issue follow-up PRs to continue improving Kibana coverage.