devonfw/IDEasy#2104: Remove unnecessary VSCode plugins

[laert-ll]

This PR fixes devonfw#2104

Implemented changes:

Removed VS Code plugins that are abandoned, effectively unused, or a niche personal-preference preset:

Extension ID	Reason
oouo-diogo-perdigao.docthis	Abandoned (~2019). This is a niche JSDoc comment generator. VSCodes built-in JS/TS language service now does this natively, therefore no longer relevant.
mhutchie.git-graph	Abandoned (~2021). VS Code ships a built-in Source Control Graph that covers the same functionality.
yycalm.linecount	Abandoned (~2014). Simple line-of-code counter, this functionality is now available through the built-in status bar selection count.
Tyriar.lorem-ipsum	Niche convenience rarely needed in real development workflow, therefore there's little reason to ship this by default.
pnp.polacode	Generates polaroid-style screenshots of code snippets, no development value.
mutantdino.resourcemonitor	Abandoned (~2015). Has known CPU-usage bugs on Windows, maybe could be replaced with something else.
silverlakesoftware.searchdocsets-vscode	Abandoned (~2015). Requires external Dash/Zeal apps which makes it useless for most users.
ms-vscode.sublime-keybindings	Sublime is rarely used nowadays and I would consider an extension just for it's keybindings a personal preference.