Show Shipyard Version in Keptn Bridge

[christian-kreuzberger-dtx]

Now that #2804 has been implemented and merged, we could show the shipyard version in Keptn Bridge, e.g., on the main screen:

FYI @ermin-muratovic @johannes-b please decide whether this makes sense and where to put this information.

[johannes-b]

This is a great idea to help users migrating from 0.7.x to 0.8.0.

I propose to add this information to the project tile since we have no other way of managing project-specific config yet. In the future, a settings page where we manage the Git-upstream would be the right place to deal with the shipyard version.

For now, I propose the following:

Validation of Shipyard version: As indicated by the mockup, a validation of the shipyard version is conducted. If the version < 0.2.x -> the project name is red and a note is displayed on how to upgrade the shipyard

[johannes-b]

In the meta-data of Keptn, mock (hard-coded) the currently supported spec version (in https://github.com/keptn/keptn/blob/master/api/handlers/metadata.go ). Use this information to perform the validation in the UI.