[allow-regression][split-non-BE][non-BE] Revise Scaling in Core-Coder Preprocessing, related to issues #2206 and #2205

Manuel Janderrequested to merge
2206-assert-in-stereo_switching_enc_fx-for-omasa-rate-switching-input-new-stv into main

Closes #2206 (closed) and #2205 (closed) without saturation.

Avoid static scale of encoder preprocessing audio signals to avoid saturations and also do not degrade SNR.

Edited by Manuel Jander

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