Fix pre-existing TypeScript and ESLint errors

[Copilot]

Two static analysis errors that cause tsc --noEmit and eslint to fail with a clean checkout.

• src/session.ts: TelemetryReporter is a named export, not a default export. Changed to named import to match the pattern already used in src/extension.ts:

  // before
  import TelemetryReporter, { ... } from "@vscode/extension-telemetry";
  // after
  import { TelemetryReporter, ... } from "@vscode/extension-telemetry";

• src/settings.ts: Removed redundant type argument on configuration.get<TSetting>(key, value) — the type is inferred from value.