Include build information in image

[chrismuellner]

• Update package path from github.com/Dynatrace/dynatrace-operator/version to github.com/Dynatrace/dynatrace-operator/src/version
• Move -ldflags to build args

Verify by checking for build information in the logs:

❯ kubectl logs deployment/dynatrace-operator
{"level":"info","ts":"2022-01-31T17:46:21.231Z","logger":"dynatrace-operator-version","msg":"dynatrace-operator","version":"latest","gitCommit":"4301342975c97392ca2bc878bd0653e1451c67a7","buildDate":"2022-01-31T17:39:11+00:00","goVersion":"go1.17.6","platform":"linux/amd64"}