documentclass[]{scrbook}

KOMAoptions{twoside=false}

usepackage{tocbibind}

addtokomafont{partentrypagenumber}{nullfont}
addtokomafont{chapterentrypagenumber}{mdseries}

usepackage{tocstyle}
    usetocstyle{allwithdot}
    settocstylefeature[-1]{leaders}{hfill}
    settocstylefeature[-1]{pagenumberhook}{nullfont}

usetocstyle{KOMAlike}
    usetocstyle{allwithdot}
    settocstylefeature[-1]{leaders}{hfill}
    settocstylefeature[-1]{pagenumberhook}{nullfont}
renewcommand*{addparttocentry}[2]{%
    addtocentrydefault{part}{partnamenobreakspace #1}{#2}%
    }%

begin{document}

frontmatter

part*{Front Matter}
    addcontentsline{toc}{part}{Front Matter}

tableofcontents
listoftables
listoffigures

mainmatter

part*{Report}
    addcontentsline{toc}{part}{Report}

chapter{Chapter 1}
    section{Section 1}
    section{Section 2}
    section{Section 3}

appendix

part*{Appendices}
    addcontentsline{toc}{part}{Appendices}

chapter{Appendix 1}
    section{Appendix Section 1}
    section{Appendix Section 2}
    section{Appendix Section 3}

end{document}