chore: update eslint, enable more rules and fix their findings (#39438)

Update eslint and its plugins, enable more rules and fix their findings:

1. `unicorn/no-unsafe-string-replacement` found that uploading a file
whose name contains `$&` inserted a broken markdown link, because
`String#replace` expands such patterns in the replacement string
2. `@typescript-eslint/require-await` removes `async` from functions
that never await
3. Plugin rules not covered by a preset are now listed explicitly

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Co-authored-by: bircni <bircni@icloud.com>

web_src/js/features/citation.ts

@@ -24,7 +24,7 @@ async function initInputCitationValue(citationCopyApa: HTMLButtonElement, citati
   citationCopyApa.setAttribute('data-text', apaOutput);
 }
 
-export async function initCitationFileCopyContent() {
+export function initCitationFileCopyContent() {
   const defaultCitationFormat = 'apa'; // apa or bibtex
 
   if (!pageData.citationFileContent) return;