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