Update AGENT_HOST on env.sh.sample across all projects

[maoo]

Every integrations application includes a local-run/env.sh.sample that helps running the app locally; AGENT_HOST is one of the environment variables that are defined, pointing against the Foundation Developer Pod.

Right now the AGENT_HOST is defined as foundation-dev-api.symphony.com (the address previously used), whereas it should be foundation-dev.symphony.com (currently used).

Example on App-Integrations-Zapier - https://github.com/symphonyoss/App-Integrations-Zapier/blob/dev/local-run/env.sh.sample#L11