etl/influxdb: Reduce batch size to 1000
We are getting 413 error (Request entity is too large), let's reduce the batch size as a limited value is recommended in the official documentation.
https://docs.influxdata.com/influxdb/v2.7/write-data/best-practices/optimize-writes/#batch-writes
Job failed example: https://gitlab.freedesktop.org/gfx-ci/mesa-performance-tracking/-/jobs/44872600
Edited by Guilherme Gallo