updated cloud console URL in README file to be external-to-google usable

[posinaga-demo]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change /kind bug /kind cleanup /kind design

/kind documentation

/kind failing-test /kind feature /kind flake

What this PR does / why we need it: Fixes an internal-to-google only URL to cloud console provided as part of instructions in README file

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE