Upgrade to Node 20, Webpack 5, npm audit fixes

Description

This ticket is to upgrade the version of node to a supported version, update webpack, and resolve any moderate or above vulnerabilities related to this repository.

This should entail the following:

Update Node to the latest LTS v20 (lts/iron) Update Webpack to v5 Update any other required dependencies to resolve aforementioned security issues

Steps:

Node

[ ] Install and use node 20 locally
```
nvm install 20
nvm use 20
```


- [ ]  Update `.nvmrc` to contain `lts/iron` and update the allowed version ins `package.json`

### Webpack et al.

- [ ] Extract the jest config from `package.json` to `jest.config.js`
Note: This allows for more modularity and lets us have dynamic paths

- [ ] Run the following:
  ```bash
      npm install webpack@latest --save-dev

[ ] Run the following:

npm install —save-dev eslint-webpack-plugin  @babel/eslint-parser  @babel/plugin-proposal-private-property-in-object
html-webpack-plugin  buffer stream-http process https-browserify url


npm uninstall eslint-loader babel-eslint

[ ] Webpack 5 does not polyfill Node.js core modules by default anymore so remove the following from the webpack config:

    node: {
      module: 'empty',
      dgram: 'empty',
      dns: 'mock',
      fs: 'empty',
      http2: 'empty',
      net: 'empty',
      tls: 'empty',
      child_process: 'empty',
    }

[ ] And add the following to the resolve key in the webpack config

                fallback: {
                    "http": require.resolve("stream-http"),
                    "https": require.resolve('https-browserify'),
                    "buffer": require.resolve('buffer'),
                    "url": require.resolve("url"),
                },

[ ] Add the following Buffer plugin to the list of plugins in the webpack config

                    Buffer: ['buffer', 'Buffer'],
                })

[ ] Update the webpack hashing function from the insecure md4 to xxhash64
[ ] Add the following lineconst __webpack_base_uri__ = 'http://localhost:3000';
[ ] Update loader notation in webpack config Usage of loader notation 'style-loader!css-loader' is deprecated and replaced with [{loader: ‘style-loader’}, {loader: ‘css-loader’}]
[ ] Update the import statement for the ManifestPlugin to the following and update the references:

const { WebpackManifestPlugin } = require('webpack-manifest-plugin');
[ ] Add the required absoluteRuntime key to babel.config.js
[ ] Replace the deprecated babel-eslint package with @babel/eslint-parser
[ ] Replace eslint loader with eslint-webpack-plugin

Import the new plugin

const ESLintPlugin = require('eslint-webpack-plugin');

Add the plugin to the plugin list in webpack.config.js

        plugins: [
            new ESLintPlugin( {
    extensions: [`js`, `jsx`, `cjs`,`mjs`,`ts`,`tsx`],
    exclude:[  `/node_modules/`, ...paths.appExcludeFromBuild],
    cache: true,
formatter: require.resolve('react-dev-utils/eslintFormatter'),
eslintPath: require.resolve('eslint'),
resolvePluginsRelativeTo: __dirname,
ignore: true,
useEslintrc: true,}),

[ ] Update buildAxiosRequest.test.js to set the addapter type to http

const axiosInstance = axios.create({
    timeout: 10000,
    adapter: 'http',
});

[ ] Update App.test.js to remove the following:

axios.defaults.adapter = require('axios/lib/adapters/http');

[ ] Run the following:
```
npm audit fix --force
```
[ ] Run the following
```
npm run lint:fix
```

Requirements:

In the commits comment take note of which packages were updated to a new major version, and any other pertinent information or steps taken to resolve issues encountered.

Acceptance Criteria:

All major and above node/NPM vulnerabilities are resolved. Node is at LTS v20 Webpack is at v5

NCIOCPL / drug-dictionary-app