Refactor BPF app tests to use table-driven pattern w/ helper func

Convert cluster and namespace BPF application tests to table-driven
structure for better maintainability and test coverage. Extract common
test functionality into reusable helper functions:
- createFakeClusterReconciler() and createFakeNamespaceReconciler() for
  setup
- runClusterReconciler() and runNamespaceReconciler() for execution
- verifyClusterBpfApplicationState() and
  verifyNamespaceBpfApplicationState()
- verifyClusterBpfProgramState() and verifyNamespaceBpfProgramState()

Inline program definitions within test cases, simplify reconciler setup
in GetBpfAppState tests, and add comprehensive verification of program
status across multiple reconciliation cycles.

Signed-off-by: Andreas Karis <[email protected]>

Author: andreaskaris