Revert "PIPE: Add pipe support for passing data into and out of terminal commands (#2395)" (#2524)

This reverts commit 92b8b58588.

Accidental merge on my part - the code is in decent shape, but isn't meant to go in for 3.0.

src/ScriptEditor/NetscriptDefinitions.d.ts

@@ -8991,21 +8991,6 @@ export interface NS {
    */
   dynamicImport(path: string): Promise<any>;
 
-  /**
-   * Retrieves the NetscriptPort handle used to get input piped to the script.
-   * Examples:
-   *
-   * If a script was run with data piped into it via the terminal:
-   * `echo input1 | run myScript.js`
-   *
-   * then `ns.getStdin().read()` inside `myScript.js` would return `"input1"`.
-   *
-   * If more data is added later (for example, if one script's terminal is piped to another script),
-   * then the script can read that data from `ns.getStdin()` as well.
-   * `await ns.getStdin().nextPortWrite()` can be used to wait until new data is available to read.
-   */
-  getStdin(): NetscriptPort | null;
-
   enums: NSEnums;
 }