Introduce DeploymentContext for GOP runtime

[FelixWende99]

Summary

This PR introduces a shared DeploymentContext for GOP runs and a ContextBuilder that
derives runtime context attributes from the existing central Config.

The Application now builds and uses the DeploymentContext at startup. Existing
configuration access remains available through context.config, keeping the current tool
lifecycle and tool order unchanged while establishing the new execution context as an
intermediate step.

Changes

• Added DeploymentContext as shared runtime context
• Added ContextBuilder to derive context attributes from Config
• Added derived context attributes for:
  • tenant mode
  • SCM-Manager deployment mode
  • airgapped mode
  • cluster distribution
• Kept the full Config available via context.config
• Updated Application to use the DeploymentContext
• Added tests for context derivation
• Kept existing tool order and tool lifecycle unchanged

Verification

• ./mvnw -q -DskipITs -DskipDockerBuild -Dtest=ApplicationTest,ContextBuilderTest test
• ./mvnw -q -DskipITs -DskipDockerBuild test