Introduced overwrite flag for build publish command which overwrites builds with same number

[bhanurp]

• All tests have passed. If this feature is not already covered by the tests, new tests have been added.
• 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 ./....

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• An optional --overwrite flag is added to build publish command to overwrite build info with same build number.
• Artifacts wont be affected

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Depends on

• Added Support to overwrite build info with same build number jfrog-cli-artifactory#45
• Support for Build info overwrite for a given build name and number jfrog-client-go#1083