Collect Node Info during reachability check if port scan was successful

[pschork]

Allows us to track node versions when nodes request reachability checks

We only attempt a NodeInfo request if the dispersal socket was validated as open.

Log from node with NodeInfo resource collection (default behavior)

{"msg":"NodeInfo","component":"DataAPIServer","operatorId":"a96bfb4a7ca981ad365220f336dc5a3de0816ebd5130b79bbc85aca94bc9b6ab","semver":"0.7.5-pre.1","os":"linux","arch":"amd64","numCpu":8,"memBytes":33545670656}

Log from node with NODE_ENABLE_NODE_INFO_RESOURCES=false will only populate semver

{"msg":"NodeInfo","component":"DataAPIServer","operatorId":"a96bfb4a7ca981ad365220f336dc5a3de0816ebd5130b79bbc85aca94bc9b6ab","semver":"0.7.5pre.1","os":"","arch":"","numCpu":0,"memBytes":0}  

Legacy operator nodes will be tracked with semver: unknown

{"msg":"NodeInfo","component":"DataAPIServer","operatorId":"a96bfb4a7ca981ad365220f336dc5a3de0816ebd5130b79bbc85aca94bc9b6ab","semver":"unknown"}                                                                                                                                                                                                       

Checks

• I've made sure the lint is passing in this PR.
• I've made sure the tests are passing. Note that there might be a few flaky tests, in that case, please comment that they are not relevant.
• Testing Strategy
  • Unit tests
  • Integration tests
  • This PR is not tested :(