Bring back IgnoreManager

Removed in https://crrev.com/c/7726281

Bug: 454624251
Change-Id: I6790747bce69e6761040397d6c8d79a0b1b3fb38
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7736559
Commit-Queue: Nikolay Vitkov <nvitkov@chromium.org>
Reviewed-by: Nikolay Vitkov <nvitkov@chromium.org>
Auto-Submit: Alex Rudenko <alexrudenko@chromium.org>
Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>

Author: OrKoN

mcp/mcp.ts

@@ -55,6 +55,7 @@ export {
 export * as MarkdownIssueDescription from '../front_end/models/issues_manager/MarkdownIssueDescription.js';
 export * as StackTrace from '../front_end/models/stack_trace/stack_trace.js';
 export * as TraceEngine from '../front_end/models/trace/trace.js';
+export {IgnoreListManager} from '../front_end/models/workspace/IgnoreListManager.js';
 export * as Marked from '../front_end/third_party/marked/marked.js';
 
 installInspectorFrontendHost(new McpHostBindings());