LTV crash fixes and updates for addressing high MLD issue in ISM formats

[x] crash fix for ltv case +10dB : [ltv-stereo bitrate switching from 13.2 kbps to 128 kbps, 32kHz in, 32kHz out]
[x] Fix for High MLD issue in ISM Stream: stv-3 ISM with metadata at 128 kbps, 48 kHz in, 32 kHz out, HOA3 out, random FER at 5%
[x] Resolved LTV crash: +10dB [ltv-stereo at 32 kbps, 32kHz in, 32kHz out, DTX on, MONO out, random FER at 5%]

Pipeline results:

• EVS 26.444 BE test passes.
• decoder pytests:
  MLD scores:
  Original inputs: 562 failed, 374 skipped
  MLD > 10: 8
  MLD > 5 : 76
  MLD < 5 : 478
  +10dB inputs: 562 failed, 374 skipped
  MLD > 10: 102
  MLD > 5 : 182
  MLD < 5 : 278
  -10dB inputs: 562 failed, 374 skipped
  MLD > 10: 2
  MLD > 5 : 19
  MLD < 5 : 541
• encoder pytests results:
  MLD scores:
  Original inputs: 562 tests:
  MLD > 10: 18
  MLD > 5 : 71
  MLD < 5 : 473
  +10dB inputs: 562 tests:
  MLD > 10: 66
  MLD > 5 : 124
  MLD < 5 : 372
  -10dB inputs: 562 tests:
  MLD > 10: 5
  MLD > 5 : 30
  MLD < 5 : 527