Use project properties instead of ReleaseInfo.java text to determine whether or not the current build is DXP

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.0.X, 7.1.X, 7.2.X, 7.3.0 CE GA1, Master
• Component/s: Dev Tools > Portal Build Env
• Labels: None
• Branch Version/s:
  7.2.x, 7.1.x, 7.0.x
• Backported to Branch:
  Committed

ReleaseInfo.java currently only gets updated with DXP/portal values when `ant compile` is run. This requirement significantly increases build times for tasks that otherwise wouldn't require the portal to be compiled (e.g. generating BOMs).