Add support in new scan results CDX upload via Xray

[eranturgeman]

• The pull request is targeting the dev branch.
• The code has been validated to compile successfully by running go vet ./....
• The code has been formatted properly using go fmt ./....
• All static analysis checks passed.
• All tests have passed. If this feature is not already covered by the tests, new tests have been added.
• Updated the Contributing page / ReadMe page / CI Workflow files if needed.
• All changes are detailed at the description. if not already covered at JFrog Documentation, new documentation have been added.

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This PR adds support in performing scan-cdx upload via Xray instead of a direct 'rt upload' call.
The existing mechanism uploads and creates the designated repo if doesnt exist. This requires an Artifactory ADMIN token.
This feature allows the user to keep providing only an Xray ADMIN token (like we used to provide in V2) and the entire process happens internally in Xray