[v9] Add `v8` suffix to lambda layer in `.craft.yml` on `v8` branch

[andreiborza]

Description

We had to remove the suffix for now as it breaks the aws integration setup:

https://github.com/getsentry/sentry/blob/c11f4c099257b2388d150f71fb39516e3d3f2328/src/sentry/integrations/aws_lambda/utils.py#L236-L253

The v8 suffixed layer ends up in the release registry (with a lower version number) so the integration assumes we are setting up an older version of the @sentry/serverless sdk.

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #15351, which was included in the 8.55.0 release.