refactor: refactor RTL paths and update test descriptions

- Updated RTL paths in various files to remove the 'ribp' prefix, reflecting the new directory structure.
- Modified test descriptions to remove version indicators (e.g., V2, V3) for clarity and consistency.
- Adjusted file references in scripts and tests to align with the new peripheral and multimedia directory structure.
- Added a new test to ensure repository layout invariants, confirming the absence of deprecated paths.

tests/test_dma.py

@@ -44,8 +44,8 @@ def test_dma_reports_bus_errors_and_transfers_exact_word_count(tmp_path: Path) -
                 str(ROOT / "rtl/mini/top/rib_if.sv"),
                 str(ROOT / "rtl/managed/clusterip/common/rtl/utils/register.sv"),
                 str(ROOT / "rtl/managed/clusterip/common/rtl/utils/fifo.sv"),
-                str(ROOT / "rtl/ip/ribp/peripheral/dma.sv"),
-                str(ROOT / "rtl/ip/ribp/peripheral/dma_core.sv"),
+                str(ROOT / "rtl/ip/peripheral/dma.sv"),
+                str(ROOT / "rtl/ip/peripheral/dma_core.sv"),
                 str(ROOT / "tests/rtl/dma_error_tb.sv"),
                 "",
             ]