fix: handle more cases of plugin config

[jasonlyu123]

#2106

Fix cases where plugins: [require('prettier-plugin-svelte')] and where plugins ['prettier-plugin-svelte'] but never installed.

There're still some cases where it would fail, like plugins: [require.resolve('prettier-plugin-svelte')] or plugins: [path.join(prcess.cwd(), 'node_modules/prettier-plugin-svelte'], but the plugin isn't installed, likely when people copy a prettier config but never pay attention to what the config actually does. Wondering if we should just show a message alert like #1763 suggested. Likely only detect errors with "Cannot find module". Or should we try to detect these two cases and fallback to using bundled version?

[dummdidumm]

Thank you!
I think we should hold off from the error modal for now. Let's see if more cases come up where people see it doesn't work as expected. If there's sufficient evidence that there are still many cases which we can't detect, then yes we can do something like that - but maybe through an icon similar to prettier that turns red or sth.