Add skip validation flag in elastic-package install command

[mrodm]

Follow-up #1163

This PR adds the --skip-validation flag to the elastic-package install command.

By default, elastic-package install will validate the zip files before installing in the Kibana instance. Setting this new flag, this validation is skipped.

NOTE: This validation is just performed from Kibana>=8.7.0 where zip files are used. Previously, it is kept the same behavior.

This applies for both install directly a local zip file or running elastic-package install.

Some examples using elastic-package install --zip:

• Running validation

 $ elastic-package install --zip ./elastic_package_registry-0.0.6.zip -v 
2023/03/08 18:15:02 DEBUG Enable verbose logging
2023/03/08 18:15:02 DEBUG Distribution built without a version tag, can't determine release chronology. Please consider using official releases at https://github.com/elastic/elastic-package/releases
2023/03/08 18:15:02 DEBUG GET https://127.0.0.1:5601/api/status
2023/03/08 18:15:02 DEBUG Validating built .zip package (path: ./elastic_package_registry-0.0.6.zip)
2023/03/08 18:15:02 DEBUG Skip validation of the built .zip package
2023/03/08 18:15:02 DEBUG Reading package manifest from ./elastic_package_registry-0.0.6.zip
Install zip package: ./elastic_package_registry-0.0.6.zip
2023/03/08 18:15:02 DEBUG POST https://127.0.0.1:5601/api/fleet/epm/packages
Installed assets:
- elastic_package_registry-313c2700-099b-11ed-91b6-3b1f9c2b2771 (type: dashboard)
- metrics-elastic_package_registry.metrics-0.0.6 (type: ingest_pipeline)
- metrics-elastic_package_registry.metrics (type: index_template)
- metrics-elastic_package_registry.metrics@package (type: component_template)
- metrics-elastic_package_registry.metrics@custom (type: component_template)
Done

• Running without validation

 $ elastic-package install --zip ./elastic_package_registry-0.0.6.zip -v --skip-validation
2023/03/08 18:14:56 DEBUG Enable verbose logging
2023/03/08 18:14:56 DEBUG Distribution built without a version tag, can't determine release chronology. Please consider using official releases at https://github.com/elastic/elastic-package/releases
2023/03/08 18:14:56 DEBUG GET https://127.0.0.1:5601/api/status
2023/03/08 18:14:56 DEBUG Skip validation of the built .zip package
2023/03/08 18:14:56 DEBUG Reading package manifest from ./elastic_package_registry-0.0.6.zip
Install zip package: ./elastic_package_registry-0.0.6.zip
2023/03/08 18:14:56 DEBUG POST https://127.0.0.1:5601/api/fleet/epm/packages
Installed assets:
- elastic_package_registry-313c2700-099b-11ed-91b6-3b1f9c2b2771 (type: dashboard)
- metrics-elastic_package_registry.metrics-0.0.6 (type: ingest_pipeline)
- metrics-elastic_package_registry.metrics (type: index_template)
- metrics-elastic_package_registry.metrics@package (type: component_template)
- metrics-elastic_package_registry.metrics@custom (type: component_template)
Done

[elasticmachine]

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• Start Time: 2023-03-07T11:55:07.789+0000

• Duration: 2 min 26 sec

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