[CARTS] Upgrade to Serverless V4

[JonHolman]

Description

Upgrade to Serverless V4

Related ticket(s)

CMDCT-4246

---

How to test

Notes

---

Pre-review checklist

• I have added thorough tests, if necessary
• I have updated relevant documentation, if necessary
• I have performed a self-review of my code
• I have manually tested this PR in the deployed cloud environment

---

Pre-merge checklist

Review

• Design: This work has been reviewed and approved by design, if necessary
• Product: This work has been reviewed and approved by product owner, if necessary

Security

If either of the following are true, notify the team's ISSO (Information System Security Officer).

• These changes are significant enough to require an update to the SIA.
• These changes are significant enough to require a penetration test.

---

convert to a different template: test → val | val → prod

[codeclimate]

The PR diff size of 8970 lines exceeds the maximum allowed for the inline comments feature.

[codeclimate]

The PR diff size of 8965 lines exceeds the maximum allowed for the inline comments feature.

[codeclimate]

The PR diff size of 8965 lines exceeds the maximum allowed for the inline comments feature.

[codeclimate]

The PR diff size of 8969 lines exceeds the maximum allowed for the inline comments feature.

[codeclimate]

Code Climate has analyzed commit 7ba9141 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (90% is the threshold).

This pull request will bring the total coverage in the repository to 81.3% (0.0% change).

View more on Code Climate.