Including large images in landscape formatting

• showframe in document with some page in landscape environment doesn't show correct page borders for landscape pages
• in landscape page you should for image width use \linewidth since \textwidth is not changed
• please use just one package for landscape orientation, not both: lscape and pdflscape (both will give in printed document the same result, but on screen pdflcsape rotate landscape page for simpler view of it content)

the following mwe, in which i omit all packages not relevant to your problem.

\documentclass{article}

\usepackage[demo]{graphicx}
\usepackage{pdflscape}

\usepackage{showframe}
\usepackage{lipsum}

\begin{document}
\thispagestyle{empty}
\lipsum[1]
\begin{landscape}
\noindent%
XXX \hfill XXX % for show width of text area
\begin{figure}[htb]
\fbox{
     \includegraphics[width=\dimexpr\linewidth-4\fboxsep-2\fboxrule]{test.png}
     }
\end{figure}
\end{landscape}
\lipsum[2]
\end{document}

gives

addendum: now with caption and example image (instead it you should use your image) and removed stuff which in previous solution show size of text area.

\documentclass{article}
\usepackage{geometry}% added  nut it not influence on solution

\usepackage{graphicx}
\usepackage{pdflscape}

\usepackage{lipsum}

\begin{document}
\thispagestyle{empty}
\lipsum[1]
\begin{landscape}
    \begin{figure}[htb]
\includegraphics[width=\linewidth]{example-image-duck}% example image provided by "graphicx"
\caption{This is some caption text that I'm using to see what this looks like with caption text. I'm not too sure about adding text in the landscape environment, as I use in my real document ... sorry, i can use image provided by you in \texttt{igmur}.}
\label{fig:landscape}
    \end{figure}
\end{landscape}
\lipsum[2]
\end{document}

as you can see,image is centered in text area. since now fbox is removed, the width of image is determined only by \linewidth

Just using landscape works fine ( I did my own version of your image, lol).

This solution ensures that when/if printing the page will be printed as usual and the person reading will have to tilt the book but in digital form the pdf is generated with tilted page.

\documentclass{article}
\usepackage[margin=1.0in]{geometry}
% so that i can crop images
\usepackage{graphicx}
\usepackage{wrapfig}
\usepackage{rotating}
\usepackage{epstopdf}
\usepackage{pdflscape}
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Save the image from this link : https://i.imgur.com/CN1gsF4.png
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Required this package for including graphics and landscaping
% \usepackage[paper=portrait,pagesize]{typearea}
% Link to the stack post
% https://tex.stackexchange.com/a/430619/69118

%%%%%%%%%%%%%%%%
% IMAGE TEST ONE
%%%%%%%%%%%%%%%%
\clearpage
A normal text page
\newpage
\begin{landscape}
\begin{figure}[t]
     \includegraphics[width=\linewidth,]{image.png}
\end{figure}
\end{landscape}
\newpage
A normal text page
\end{document}