fix: transpile to commonJS instead of es modules

[vickyyyyyyy]

Files are currently being built to es modules which give errors when using Jest to run tests for components from other projects which import this:

The above error is normally fixed by adding to transformIgnorePattern to use babel to transpile correctly (in the project which is trying to imprt from ui-enterprise) but this doesn't work for some reason.

Therefore, we are now simplifying this by transpiling to CommonJS instead.

Before (dist/index.js):

/**
 * A library containing the different design components of the Grafana enterprise plugins ecosystem.
 *
 * @packageDocumentation
 */
export * from './components';
//# sourceMappingURL=index.js.map

After (dist/index.js):

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
/**
 * A library containing the different design components of the Grafana enterprise plugins ecosystem.
 *
 * @packageDocumentation
 */
tslib_1.__exportStar(require("./components"), exports);
//# sourceMappingURL=index.js.map