fix(lib/vscode): update csp in webview to allow ports #4131
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With #3895, we caused a regression where the Content-Security-Policy prevented
images in the previewer to not work due to the ports in the resource URI.
This modifies the CSP in the webview to make sure images are not blocked by CSP.
I assume once we upgrade VS Code, we will revert this change.
Screeshot
See notes here: #3936 (comment)
Fixes #3936 #4098
TODOs
Looks like this PR is a two-for-one!