pwsh syntax fix

    - echo "generate references"

    # encoder, constant brate

    - testcase_timeout=240   # to be reviewed

    - $testcase_timeout=240   # to be reviewed

    - $zero_errors_enc_const_br_ref=0

    - ("& python -m pytest .\tests\codec_be_to_accepted_release\encoder\test_encoder_constant_bitrate.py --update_ref 1 --ref_encoder_path IVAS_cod_ref.exe --ref_decoder_path IVAS_dec_ref.exe --dut_encoder_path IVAS_cod_dut.exe --dut_decoder_path IVAS_dec_dut.exe --html=logs/report-enc-const_br-ref.html --self-contained-html --junit-xml=logs/report-junit-enc-const_br-ref.xml --testcase_timeout $testcase_timeout | out-null") | Invoke-Expression

    - IF (!(Select-String logs/report-junit-enc-const_br-ref.xml -Pattern 'errors="0"')){$zero_errors_enc_const_br_ref=1; echo "Errors encountered"}