feat(b2b):B2B-4545 Update v2/frontend/companies to include mandatory customerEmail field

[bc-akshatkaushik]

B2B-4545

What changed?

• Update POST v2/frontend/companies request schema to include new required field customerEmail
• Add validation error example for missing field

Release notes draft

• Add new required field customerEmail to POST v2/frontend/companies

ping @bc-Vince @bc-sylvialin @chris-nowicki

[bc-Vince]

The changes in the Company spec look good. The storefront.yaml file was migrated with other developer docs when we switched from Stoplight, but it does not actually correspond to any live developer documentation. As a result, there is no need to make edits to it.

[bc-akshatkaushik]

The changes in the Company spec look good. The storefront.yaml file was migrated with other developer docs when we switched from Stoplight, but it does not actually correspond to any live developer documentation. As a result, there is no need to make edits to it.

Thanks Vince that's good to know, perhaps we can leave the changes in for now, in case they get pulled in by a LLM lookup or the like who doesn't know the difference about what's live and what's not
Until ultimately we can remove the file no longer serving things in Production to avoid the confusion/duplication