chore(clients): bump target to ES2020 and remove outdated libs

[trivikr]

Issue

Internal JS-3616
Blog post: Announcing the end of support for Internet Explorer 11 in the AWS SDK for JavaScript (v3)

This PR will be rebased and made ready after v3.182.0 release on Sep 30th.

Description

Bumps target to ES2020 and removes outdated libs in clients

Testing

Before: class is converted to function in ES5

$ client-acm> yarn clean && yarn build:include:deps

$ client-acm> sed -n 15,20p dist-es/ACM.js         
import { RequestCertificateCommand, } from "./commands/RequestCertificateCommand";
import { ResendValidationEmailCommand, } from "./commands/ResendValidationEmailCommand";
import { UpdateCertificateOptionsCommand, } from "./commands/UpdateCertificateOptionsCommand";
var ACM = (function (_super) {
    __extends(ACM, _super);
    function ACM() {

After: class is retained as class in ES2020

$ client-acm> yarn clean && yarn build:include:deps

$ client-acm> sed -n 15,20p dist-es/ACM.js 
import { ResendValidationEmailCommand, } from "./commands/ResendValidationEmailCommand";
import { UpdateCertificateOptionsCommand, } from "./commands/UpdateCertificateOptionsCommand";
export class ACM extends ACMClient {
    addTagsToCertificate(args, optionsOrCb, cb) {
        const command = new AddTagsToCertificateCommand(args);
        if (typeof optionsOrCb === "function") {

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[vincemtnz]

Does this mean node v12 is no longer supported a month earlier than planned? (unless one also configures their bundler target + polyfills?)

[kuhe]

This only affects the dist-es ESM distributions. NodeJS uses dist-cjs.

[github-actions]

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