refactor: remove legacy scheduling and analytics code

- Deleted the scheduler module and its associated functions, transitioning to OS-level scheduling.
- Removed the Analytics module and its related interfaces, retaining only a placeholder for backward compatibility.
- Updated ConfigValidator to warn about legacy schedule and analytics configurations.
- Cleaned up StartupValidator to remove diagnostics and schedule validation logic.
- Adjusted Load.ts to handle legacy flags for diagnostics and analytics.
- Removed unused diagnostics capturing functionality.

src/browser/BrowserUtil.ts

@@ -2,7 +2,6 @@ import { Page } from 'rebrowser-playwright'
 import { load } from 'cheerio'
 
 import { MicrosoftRewardsBot } from '../index'
-import { captureDiagnostics as captureSharedDiagnostics } from '../util/Diagnostics'
 
 type DismissButton = { selector: string; label: string; isXPath?: boolean }
 
@@ -219,12 +218,4 @@ export default class BrowserUtil {
         } catch { /* swallow */ }
     }
 
-    /**
-     * Capture minimal diagnostics for a page: screenshot + HTML content.
-     * Files are written under ./reports/<date>/ with a safe label.
-     */
-    async captureDiagnostics(page: Page, label: string): Promise<void> {
-        await captureSharedDiagnostics(this.bot, page, label)
-    }
-
 }