Add record_ecosystem_meta API support

[rhyskoedijk]

In dependabot/dependabot-core#10905, a new record_ecosystem_meta API was added. This API is not implemented by dependabot-cli.

When performing updates for an ecosystem that invokes the API (e.g. pip), the API server will throw 501 errors until updater retry limit is reached:

cli | 2025/03/09 21:40:17 unexpected output type: record_ecosystem_meta
proxy | 2025/03/09 21:40:17 [024] POST http://host.docker.internal:44891/update_jobs/update_0_pip_all/record_ecosystem_meta
proxy | 2025/03/09 21:40:17 [024] 501 http://host.docker.internal:44891/update_jobs/update_0_pip_all/record_ecosystem_meta
cli | 2025/03/09 21:40:22 unexpected output type: record_ecosystem_meta
proxy | 2025/03/09 21:40:22 [025] POST http://host.docker.internal:44891/update_jobs/update_0_pip_all/record_ecosystem_meta
proxy | 2025/03/09 21:40:22 [025] 501 http://host.docker.internal:44891/update_jobs/update_0_pip_all/record_ecosystem_meta
cli | 2025/03/09 21:40:27 unexpected output type: record_ecosystem_meta
proxy | 2025/03/09 21:40:27 [026] POST http://host.docker.internal:44891/update_jobs/update_0_pip_all/record_ecosystem_meta
proxy | 2025/03/09 21:40:27 [026] 501 http://host.docker.internal:44891/update_jobs/update_0_pip_all/record_ecosystem_meta
cli | 2025/03/09 21:40:31 unexpected output type: record_ecosystem_meta
proxy | 2025/03/09 21:40:31 [027] POST http://host.docker.internal:44891/update_jobs/update_0_pip_all/record_ecosystem_meta
proxy | 2025/03/09 21:40:31 [027] 501 http://host.docker.internal:44891/update_jobs/update_0_pip_all/record_ecosystem_meta
updater | 2025/03/09 21:40:31 ERROR <job_update_0_pip_all> Failed to record ecosystem meta after 3 retries

This API is called multiple times per dependency update and is compounded by the 3 retries per call. The volume of these errors causes the update process to take significantly longer than normal.

After this change, the API server returns 200 and the updater doesn't report error:

proxy | 2025/03/09 22:15:29 [128] POST http://host.docker.internal:35303/update_jobs/update_0_pip_all/record_ecosystem_meta
proxy | 2025/03/09 22:15:29 [128] 200 http://host.docker.internal:35303/update_jobs/update_0_pip_all/record_ecosystem_meta

The output scenario file now contains the record_ecosystem_meta data:

[rhyskoedijk]

@kbukum1, @amazimbe, @abdulapopoola tagging for visibility as you were involved with the original change dependabot/dependabot-core#10905.

[jakecoffman]

Thank you!