Add allowInsecureProtocol flag for http-configured Artifactory Repositories on Gradle

[kouta-kun]

• [ ] All tests passed. If this feature is not already covered by the tests, I added new tests.

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Hi! My current enterprise still has an HTTP Artifactory which I was not able to push to using the latest version, so I added the feature as a pass-through to the configured Gradle Repository. I was not able to get the tests working as I got a "Task with path 'pluginUnderTestMetadata' not found in project ':build-info-extractor-gradle'.", if anyone knows what that's about I'm okay with fixing it.

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[kouta-kun]

recheck

[kouta-kun]

I have read the CLA Document and I hereby sign the CLA

[yahavi]

Thanks for this contribution, @kouta-kun! Due to the complexity and issues of upgrading to Gradle 7, would you mind keeping just the core changes of this PR of adding the allowInsecureProtocol flag? That way we can review and add this feature quickly.