BASOP porting MR 352 - Port MR 2172 from float - 20250702 cleanup

Basic Info

• Original merge request in float repo: ivas-codec-pc/ivas-codec!2172 (merged)

Cleanup of the following switches, as decided on 2025-07-01.

BE

• FIX_1335_EXTREND_RETCODE - FhG: Add modification of returncode for external renderer when an error occurs -> accept ⚠️ already ported without switch in !1818 (merged) and !1819 (merged)

Non-BE

• NONBE_1250_MCMASA_LS_OUTPUT - VA: issue 1250: fix crash in McMASA to custom LS output decoding -> accept ⚠️ already cleaned out with !2178 (merged) / !2180 (merged)
• NONBE_1302_FIX_OMASA_JBM_FLUSH - VA: issue 1302: fix OMASA JBM bitrate switching flush in binaural output -> accept
• NONBE_1324_TC_BUFFER_MEMOERY_KEEP - VA: issue 1324: do not reset TSM memory in JBM bitrate switching -> accept