fix(atomic-react): remove traces of npm imports

[alexprudhomme]

https://coveord.atlassian.net/browse/KIT-3659

This PR main goal is to fix the ESM output in the CDN by removing the traces of npm imports.

This is achieved by two things.

1. Bundle all of atomic-react (both esm and cjs module) in rollup. Before esm was bundled with tsc and cjs with rollup.

before 😆

graph TD;
    rollup-->CJS;
    tsc-->ESM;
    tsc-->types;

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after 😆

graph TD;
    rollup-->CJS;
    rollup-->ESM;
    tsc-->types;

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This is the current state of the dist folder.

dist/
├── cjs/
│   ├── atomic-react.cjs
│   ├── recommendation/
│   │   └── atomic-react.cjs
│   └── commerce/
│       └── atomic-react.cjs
├── esm/
│   ├── atomic-react.mjs
│   ├── recommendation/
│   │   └── atomic-react.mjs
│   └── commerce/
│       └── atomic-react.mjs
└── types/
    ├── index.d.ts
    ├── recommendation.index.d.ts
    ├── commerce.index.d.ts
    └── components/
        └── ...

2. Add @coveo/atomic/loader to the list of cdn externalizations. https://github.com/coveo/ui-kit/pull/4581/files#r1812922022

3. Fix the ouptput in the CDN it now looks something like this for the proper files :

[github-actions]

Pull Request Report

PR Title

✅ Title follows the conventional commit spec.

Live demo links

• Storybook

• Playwright report

Bundle Size

File	Old (kb)	New (kb)	Change (%)
case-assist	236.6	236.6	0
commerce	341.5	341.5	0
search	412.3	412.3	0
insight	401.6	401.6	0
recommendation	248.8	248.8	0
ssr	406	406	0
ssr-commerce	353.6	353.6	0

SSR Progress

Use case	SSR (#)	CSR (#)	Progress (%)
search	39	44	89
recommendation	0	4	0
case-assist	0	6	0
insight	0	27	0
commerce	0	15	0

Detailed logs

search : buildInteractiveResult
search : buildInteractiveInstantResult
search : buildInteractiveRecentResult
search : buildInteractiveCitation
search : buildGeneratedAnswer
recommendation : missing SSR support
case-assist : missing SSR support
insight : missing SSR support
commerce : missing SSR support

[louis-bompart]

VG PR 👍

[fpbrault]

Nice job!