Issue:
fix(dashboard_metadata): Fix prod intent emails

Currently prod intent emails are not going to biz email. Email are working on custom integ, integ main pod and custom sandbox pod with some code changes. Need to check if sandbox main pod is also able to send emails.

Resolution:
<think>
PR Context:
- Title: refactor(email): Add recipient emails in email config
- Merged: 2024-09-19T14:16:13Z
- Files changed: 13 files
- Commits: 6 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
- This PR add recipient emails for recon and prod_intent under email config.

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [x] This PR modifies application configuration/env
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** refactor(email): Add recipient emails in email config (#5964)
Files to modify:


**crates/external_services/src/email.rs**
  Modify existing code

**crates/router/src/configs/secrets_transformers.rs**
  Modify existing code

**crates/router/src/configs/settings.rs**
  Remove:
    - struct: pub::RecipientMails

**crates/router/src/consts/user.rs**
  Modify existing code

**crates/router/src/core/recon.rs**
  Modify existing code

**crates/router/src/core/user/dashboard_metadata.rs**
  Modify existing code

**crates/router/src/services/email/types.rs**
  Modify existing code

**crates/router/src/utils/user/dashboard_metadata.rs**
  Modify existing code