build(headless-react): move to esm

[mrrajamanickam-coveo]

• Modify configs to make package esm and prep it for publishing to npm
  • Not adding a bundler as we are supporting only esm (and tsc is sufficient for now)
  • Tsconfig for the tests are not esm due to a bug in ts-jest
• Minor changes to vscode workspace file - remove obsolete entry and reorder

https://coveord.atlassian.net/browse/KIT-2661

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA 8d3ab8f.

Ensure that dependencies are being submitted on PR branches and consider enabling retry-on-snapshot-warnings. See the documentation for more information and troubleshooting advice.

Scanned Manifest Files

package-lock.json

• mri@1.2.0
• publint@0.2.2
• sade@1.8.1

packages/headless-react/package.json

• publint@0.2.2
• rimraf@5.0.1

[github-actions]

Pull Request Report

PR Title

✅ Title follows the conventional commit spec.

Bundle Size

File	Old (kb)	New (kb)	Change (%)
case-assist	184.1	184.1	0
commerce	272.3	272.3	0
search	354.1	354.1	0
insight	305.9	305.9	0
product-listing	296.4	296.4	0
product-recommendation	158.2	158.2	0
recommendation	197.6	197.6	0
ssr	325.2	325.2	0

[btaillon-coveo]

perfect!

[mrrajamanickam-coveo]

Quantic tests (unrelated to this PR) are failing with

read ECONNRESET
Error: read ECONNRESET
    at TCP.onStreamRead (node:internal/stream_base_commons:217:20)

Failures are not related to this PR. Proceeding to merge.