Rename "teamEnv" to "accountEnv"

[ehmicky]

Background at netlify/build#2040 (comment)

We use both "account" and "team" terms in the Netlify Build repository.

It seems like an account is either a team or user.

https://github.com/netlify/open-api/blob/309feb2f40dc7b1003e94cfbda87b63e7bee4116/swagger.yml#L1233

We should rename those terms accordingly in the repository, including in open PRs (e.g. netlify/build#2040)

[ehmicky]

From further inquiry, it seems like account is the same concept as team. "Account" being the name in the code and "team" the name in the UI and documentation.
If that is the case, it seems to me this monorepo should be good (since it uses the word "account"), but the CLI might need some renaming (since it uses the word "team", for example for team environment variables).

[ehmicky]

After further checks, it appears the only action needed is to rename teamEnv to accountEnv in the CLI.

[ehmicky]

Done, thanks @eduardoboucas !