In PatternFly 6, the colour of the masthead changes depending upon the mode (light vs dark). As a result, a single custom logo may not work for both cases (as is the case with the existing OKD and OpenShift logos as they assume the masthead background is always dark and include white text as a result). We need to add the ability to specify a second logo to account for this.

See https://docs.openshift.com/container-platform/4.17/web_console/customizing-the-web-console.html#adding-a-custom-logo_customizing-web-console

AC:

• update console server:
  • update the bridge flag to pass additional logo file URL to the bridge
  • to server the additional logo either as part of a new endpoint or by the current `/custom-logo` endpoint
• update console frontend to fetch the additional logo file and render it based on the preferred theme