CCM-9704: rm plaintext

Author: alexnuttall

utils/utils/src/email-client.ts

@@ -7,7 +7,6 @@ import { LetterTemplate } from 'nhs-notify-web-template-management-utils';
 import Handlebars from 'handlebars';
 import { readFileSync } from 'node:fs';
 import path from 'node:path';
-import { randomUUID } from 'node:crypto';
 
 export class EmailClient {
   constructor(
@@ -101,11 +100,6 @@ export class EmailClient {
           data: emailContent,
         });
 
-        msg.addMessage({
-          contentType: 'text/plain',
-          data: 'plaintext fallback',
-        });
-
         const command = new SendRawEmailCommand({
           RawMessage: {
             Data: Buffer.from(msg.asRaw()),