fix(loki sink): Add accept option to out_of_order_action (#11133)

* fix(loki sink): Add accept option to Loki sink out_of_order action

Fixes: https://github.com/vectordotdev/vector/issues/11131

* fix(loki sink): Don't limit concurrency if out of order events are accepted

* Fix integration tests

I removed the tests/data/loki-config.yaml config file because the newer
version of Loki wasn't starting with it. Instead I just used the default
one, but override the setting we needed (auth.enabled).

Signed-off-by: Jesse Szwedko <jesse@szwedko.me>

* Back out concurrency adjustments

Signed-off-by: Jesse Szwedko <jesse@szwedko.me>

Co-authored-by: Jesse Szwedko <jesse@szwedko.me>