(CF Compliance) (RUNW/GUNW) `ionosphereOutliers` datasets have `dtype=object`

Description: ionosphereOutliers datasets have dtype=object, which is not a valid NetCDF/HDF5 data type for CF.

Affected Products: RUNW, GUNW

CF Requirement:

Variables must use standard data types.

CF Conventions 1.7, Section 2.2: Data Types

Link: http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/cf-conventions.html#_data_types

  Quote:                                                                                                                                
  "The netCDF data types char, byte, short, int, float or real, and double are all acceptable.
   The char type is not intended for numeric data. One byte numeric data should be stored
   using the byte data type. It is possible to treat the byte type as unsigned by using the
   NUG convention of indicating the unsigned range using the valid_min, valid_max, 
   or valid_range attributes."

Impact:

• Cannot be read by standard NetCDF tools
• May cause crashes in CF-compliant software

Test Datasets Checked:
Datasets checked were produced by mission operations with CRID 05016.

NISAR_L1_PR_RUNW_007_106_A_140_008_7700_SH_20251211T140849_20251211T140926_20251223T140850_20251223T140926_X05016_N_P_J_001.h5
NISAR_L2_PR_GUNW_001_062_A_019_006_2000_SH_20250927T114508_20250927T114542_20251126T114516_20251126T114545_X05016_P_F_J_001.h5

HDF5 Path:

Dataset: /science/LSAR/{PRODUCT}/metadata/processingInformation/algorithms/ionosphereEstimation/ionosphereOutliers
  dtype (actual): object
  dtype (should be): Fixed-length string (e.g., 'S100')

Description of ionosphereOutliers:

Algorithm identifying outliers in unfiltered ionosphere phase screen

cc: @hfattahi @oberonia78 @xhuang-jpl

Start by tracing the writer for /science/LSAR/{PRODUCT}/metadata/processingInformation/algorithms/ionosphereEstimation/ionosphereOutliers in the Python code; no source file or test is named. Check how its dtype is constructed for RUNW and GUNW, then validate the produced datasets against the stated fixed-length string requirement and standard NetCDF/HDF5 tooling.