build: update lint ignore to biome in xterm-test-helpers.ts

Switch the lint ignore directive from ESLint to Biome syntax for the control characters regex in the stripAnsi function.

Author: MBanucu

test/e2e/xterm-test-helpers.ts

@@ -102,7 +102,7 @@ export const waitForTerminalRegex = async (
       // Browser-compatible stripAnsi implementation
       function stripAnsi(str: string): string {
         return str.replace(
-          // eslint-disable-next-line no-control-regex
+          // biome-ignore lint/suspicious/noControlCharactersInRegex: Intentional control characters for ANSI escape sequence stripping
           /[\u001B\u009B][[()#;?]*(?:(?:[a-zA-Z\d]*(?:;[a-zA-Z\d]*)*)?\u0007|(?:\d{1,4}(?:;\d{0,4})*)?[\\dA-PR-TZcf-ntqry=><~])/g,
           ''
         )