Fix openssf warnings and refactor dumpTensor call

- Updated dumpTensor to use std::ostringstream instead of dynamic format strings
  with fprintf.
- Parsed g_func_config.fp_format (e.g., "0.5") into width and precision using istringstream.
- Applied std::fixed, std::setw, and std::setprecision to format the floating-point
  value safely and consistently.
- Fixed few other openssf warnings.
- Refactor dumpTensor function call.

Change-Id: I8ccbab5ae4afa38803fc053ba5f423840aba50ce
Signed-off-by: Yuvaraj Venkatesh <yuvaraj.venkatesh@arm.com>