remove not implemented create function (#804)

<img width="665" height="461" alt="image"
src="https://github.com/user-attachments/assets/6fefb586-064d-4779-bbb7-74bbd53f4e4c"
/>
This is incorrect as it should not have the "click to create" part of
the message under pipenv

Author: eleanorjboyd

src/managers/pipenv/pipenvManager.ts

@@ -1,7 +1,5 @@
 import { EventEmitter, MarkdownString, ProgressLocation, Uri } from 'vscode';
 import {
-    CreateEnvironmentOptions,
-    CreateEnvironmentScope,
     DidChangeEnvironmentEventArgs,
     DidChangeEnvironmentsEventArgs,
     EnvironmentChangeKind,
@@ -115,14 +113,6 @@ export class PipenvManager implements EnvironmentManager {
         );
     }
 
-    async create?(
-        _scope: CreateEnvironmentScope,
-        _options?: CreateEnvironmentOptions,
-    ): Promise<PythonEnvironment | undefined> {
-        // To be implemented
-        return undefined;
-    }
-
     async refresh(scope: RefreshEnvironmentsScope): Promise<void> {
         const hardRefresh = scope === undefined; // hard refresh when scope is undefined