Email admin when business removed by staff

* As an account administrator
* I want an automated email notification
* so that I know if staff has unaffiliated a business with my account

**Acceptance Criteria**

**Scenario 1: Email notification**
* GIVEN staff has received a form
* WHEN the staff completes the removal of a business from an account
* THEN an automated email will be sent to the account administrator(s) with notification of the change

CONTENT:

Staff has removed [INSERT BUSINESS NAME HERE) from your BC Registries account. This action was taken after staff received a formal request. If you have questions, please contact us at:

Toll Free:1-877-526-1526
Phone: 250 387-7848
Email: bcregistries@gov.bc.ca

Hours of Operation:
Monday to Friday, 8:30am - 4:30pm PST
...

**Dependencies? What is the impact of this dependency? (If so, link dependency in the ticket, make it visible in a team´s backlog)**
* Do you know a possible contact person to reach out (from the other team)?

**Validation Rules? (If yes, list here)**

**Design**
@xxx - please link the Design here

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**Link to DoR for a US/ Feature**
https://github.com/bcgov/entity/blob/master/.github/ISSUE_TEMPLATE/DoR%20-%20Relationships.md
https://github.com/bcgov/entity/blob/master/.github/ISSUE_TEMPLATE/DoR%20-%20Entity.md

**Link to the DoD for a US/ Feature**
https://github.com/bcgov/entity/blob/master/.github/ISSUE_TEMPLATE/DoD%20-%20Relationships.md
https://github.com/bcgov/entity/blob/master/.github/ISSUE_TEMPLATE/DoD%20-%20Entity.md

Start with issue #6218 and review the account/business-removal flow in the entity repository; the issue names no files, tests, or entry points. Confirm how staff removal is completed and how account administrators are identified, then validate that the specified notification is sent with the stated content after removal.

Written by the indexing model from the issue text.