fix(companies): sync contact company names (#14759)

Fixes company-contact name drift when a company is renamed or deleted.

Closes: N/A

## Why
Contacts keep a denormalized `additional_attributes.company_name` for
display and filtering. Company rename/delete flows could leave that
copied value stale even though the actual `company_id` relationship
changed.

## What changed
- Enqueues an async company contact-name sync job when a company name
changes.
- Moves company deletion into `Companies::DeleteJob`.
- The delete job unlinks linked contacts, clears only the copied
`company_name`, and then deletes the company.
- Uses bulk JSON updates for the cleanup path so contact records are not
saved, which avoids contact update callbacks, webhook dispatch, and
automation side effects.

## How to test
- Link a contact to a company, rename the company, and confirm the
contact company name updates after the job runs.
- Delete a company with linked contacts and confirm the delete job
removes the company, unassigns linked contacts, and preserves other
contact additional attributes.

---------

Co-authored-by: Sony Mathew <sony@chatwoot.com>
Co-authored-by: Sony Mathew <2040199+sony-mathew@users.noreply.github.com>

spec/enterprise/controllers/api/v1/accounts/companies_controller_spec.rb

@@ -385,13 +385,13 @@ RSpec.describe 'Companies API', type: :request do
       let(:admin) { create(:user, account: account, role: :administrator) }
       let(:company) { create(:company, account: account) }
 
-      it 'deletes the company' do
-        company
+      it 'enqueues company deletion' do
         expect do
           delete "/api/v1/accounts/#{account.id}/companies/#{company.id}",
                  headers: admin.create_new_auth_token,
                  as: :json
-        end.to change(Company, :count).by(-1)
+        end.to have_enqueued_job(Companies::DeleteJob).with(company_id: company.id)
+
         expect(response).to have_http_status(:ok)
       end
     end