Revert "Add ui_web to embedder.yaml so that the analyzer knows about it."

[zanderso]

Reverts #40827

This is causing the engine -> framework roll to fail in docs generation

[zanderso]

Starting in flutter/flutter#123905

https://ci.chromium.org/ui/p/flutter/builders/try/Linux%20docs_test/25897/overview

Executing: (cd dev/docs ; /b/s/w/ir/x/w/Á flutter sdk/bin/cache/dart-sdk/bin/dart global run dartdoc --allow-tools --no-validate-links --link-to-source-excludes ../../bin/cache --link-to-source-root ../.. --link-to-source-uri-template [https://github.com/flutter/flutter/blob/master/%f%#L%l](https://github.com/flutter/flutter/blob/master/%25f%25#L%25l)% --inject-html --use-base-href --header styles.html --header analytics.html --header survey.html --header snippets.html --header opensearch.html --footer-text lib/footer.html --allow-warnings-in-packages Flutter,platform_integration,flutter_localizations,flutter_goldens,flutter_driver,flutter,flutter_test,flutter_web_plugins,integration_test --exclude-packages analyzer,args,barback,csslib,flutter_goldens,flutter_goldens_client,front_end,fuchsia_remote_debug_protocol,glob,html,http_multi_server,io,isolate,js,kernel,logging,mime,mockito,node_preamble,plugin,shelf,shelf_packages_handler,shelf_static,shelf_web_socket,utf,watcher,yaml --exclude dart:io/network_policy.dart,package:Flutter/temp_doc.dart,package:http/browser_client.dart,package:intl/intl_browser.dart,package:matcher/mirror_matchers.dart,package:quiver/io.dart,package:quiver/mirrors.dart,package:vm_service_client/vm_service_client.dart,package:web_socket_channel/html.dart --favicon=favicon.ico --package-order flutter,Dart,platform_integration,flutter_test,flutter_driver --auto-include-dependencies)
dartdoc:stdout: Documenting Flutter...
dartdoc:stderr:
dartdoc:stderr: dartdoc 6.2.1 (/b/s/w/ir/x/w/.pub-cache/global_packages/dartdoc/bin/dartdoc.dart-3.0.0-387.0.dev.snapshot) failed: fatal error: unable to locate the input directory at /b/s/w/ir/x/w/Á flutter sdk/bin/cache/pkg/sky_engine/lib/ui_web..

[eyebrowsoffire]

LGTM