refactor: replace simulation tool SyntaxError with RuntimeError

The `SyntaxError` is meant for use by Python's parser. Though we are
doing our own parsing logic here, it is typically used to suggest an
error in some given Python source code, not a file in general.

Signed-off-by: Alex Jones <alex.jones@lowrisc.org>

Author: AlexJones0

src/dvsim/sim/tool/vcs.py

@@ -52,7 +52,7 @@ def get_cov_summary_table(cov_report_path: Path) -> tuple[Sequence[Sequence[str]
 
         # If we reached here, then we were unable to extract the coverage.
         msg = f"Coverage data not found in {cov_report_path}!"
-        raise SyntaxError(msg)
+        raise RuntimeError(msg)
 
     @staticmethod
     def get_job_runtime(log_text: Sequence[str]) -> tuple[float, str]:

src/dvsim/sim/tool/xcelium.py

@@ -80,7 +80,7 @@ def get_cov_summary_table(cov_report_path: Path) -> tuple[Sequence[Sequence[str]
 
         # If we reached here, then we were unable to extract the coverage.
         msg = f"Coverage data not found in {buf.name}!"
-        raise SyntaxError(msg)
+        raise RuntimeError(msg)
 
     @staticmethod
     def get_job_runtime(log_text: Sequence[str]) -> tuple[float, str]: