[PM-17189] Remove LP fileless importer (#12918)

* Remove LP fileless importer

- Remove content scripts
- Remove additions to message handlers and notifcation queue
- Remove UI elements for the importer
- Remove the actual importer code
- Remove unsued keys from en/messages.json
Remove feature flag "browser-fileless-
import"
Update webpack.config and manifest files to no longer include content scripts

* Move feature flag idp-auto-submit-login under autofill grouping

---------

Co-authored-by: Daniel James Smith <djsmith85@users.noreply.github.com>

apps/browser/webpack.config.js

@@ -206,9 +206,7 @@ const mainConfig = {
     "overlay/list":
       "./src/autofill/deprecated/overlay/pages/list/bootstrap-autofill-overlay-list.deprecated.ts",
     "encrypt-worker": "../../libs/common/src/platform/services/cryptography/encrypt.worker.ts",
-    "content/lp-fileless-importer": "./src/tools/content/lp-fileless-importer.ts",
     "content/send-on-installed-message": "./src/vault/content/send-on-installed-message.ts",
-    "content/lp-suppress-import-download": "./src/tools/content/lp-suppress-import-download.ts",
   },
   optimization: {
     minimize: ENV !== "development",
@@ -312,8 +310,6 @@ if (manifestVersion == 2) {
   // Manifest V2 background pages can be run through the regular build pipeline.
   // Since it's a standard webpage.
   mainConfig.entry.background = "./src/platform/background.ts";
-  mainConfig.entry["content/lp-suppress-import-download-script-append-mv2"] =
-    "./src/tools/content/lp-suppress-import-download-script-append.mv2.ts";
   mainConfig.entry["content/fido2-page-script-append-mv2"] =
     "./src/autofill/fido2/content/fido2-page-script-append.mv2.ts";
   mainConfig.entry["content/fido2-page-script-delay-append-mv2"] =