Simplify logic for webview resource uris (#123740)

* Simplify logic for webview resource uris

This change attempts to simplify the logic around webview resource uris by doing the following:

- Hard code the resource origin. We always will be hitting a service worker for these paths so they don't need to be dynamic (although in the future we may want to pull them from `product.json`)

    This lets us remove these properties from the environment service

- Move remote handling from the resource loader in `asWebviewUri`.

- Remove the handling of http and https paths from the resource loader.

    I don't think these cases can be hit any longer (although I need to confirm this with more testing for the web case). Instead I added a check to `asWebviewUri` so that we return the original uri if a http(s) uri is passed in

* Restore normalizeResourcePath

We still need to convert between a remote uri and one that our remote file system can read

* Fix test

* Restore passing in remote on extension side

* Remove only

src/vs/workbench/api/common/extHostCodeInsets.ts

@@ -10,7 +10,7 @@ import { ExtHostTextEditor } from 'vs/workbench/api/common/extHostTextEditor';
 import { ExtHostEditors } from 'vs/workbench/api/common/extHostTextEditors';
 import type * as vscode from 'vscode';
 import { ExtHostEditorInsetsShape, MainThreadEditorInsetsShape } from './extHost.protocol';
-import { asWebviewUri, WebviewInitData } from 'vs/workbench/api/common/shared/webview';
+import { asWebviewUri, webviewGenericCspSource, WebviewInitData } from 'vs/workbench/api/common/shared/webview';
 import { generateUuid } from 'vs/base/common/uuid';
 
 export class ExtHostEditorInsets implements ExtHostEditorInsetsShape {
@@ -66,11 +66,11 @@ export class ExtHostEditorInsets implements ExtHostEditorInsetsShape {
 			private _options: vscode.WebviewOptions = Object.create(null);
 
 			asWebviewUri(resource: vscode.Uri): vscode.Uri {
-				return asWebviewUri(that._initData, this._uuid, resource);
+				return asWebviewUri(this._uuid, resource, that._initData.remote.authority);
 			}
 
 			get cspSource(): string {
-				return that._initData.webviewCspSource;
+				return webviewGenericCspSource;
 			}
 
 			set options(value: vscode.WebviewOptions) {