chore(tasks) Use a shared taskbroker container

[markstory]

Align with sentry + seer usage of taskbroker as a shared local development service. I tested this locally with

devservices up taskbroker
make worker

The worker was able to connect to the taskbroker that was running.

Refs STREAM-874

[linear-code]

STREAM-874 Make taskbroker a shared devservice

[sentry]

Bug: The mode: containerized setting in devservices/config.yml is incorrectly nested under the remote: block and should be a sibling attribute.
_{Severity: HIGH}

Suggested Fix

In devservices/config.yml, move the mode: containerized line out from under the remote: block. Adjust its indentation to be at the same level as the remote: key, making them sibling attributes. This will ensure devservices correctly interprets the intended startup mode.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: devservices/config.yml#L10-L17

Potential issue: In `devservices/config.yml`, the `mode: containerized` attribute is
incorrectly placed inside the `remote:` block. The `mode` attribute should be a sibling
to the `remote:` block, not a child. This incorrect nesting will likely cause
`devservices` to ignore the `mode` setting because it is not a valid field within the
`remote:` configuration schema. As a result, the dependency will start in its default
mode instead of the intended containerized mode, leading to incorrect behavior in the
development or CI environment.

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[markstory]

you wrong, all the other usage of mode: containerized are also nested under remote in sentry + seer.