Add build-info icon

[yahavi]

• [x] This pull request is created in the jfrog/jenkins-jfrog-plugin repository.

• Fix https://github.com/jenkinsci/jfrog-plugin/issues/8

• Take us one step closer to achieve https://github.com/jenkinsci/jfrog-plugin/issues/11

Add build-info button if the 'rt build-publish' command executed.

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