Moving EmptyOperator to standard provider

[amoghrajesh]

Basic dag tested:

from airflow import DAG
from airflow.providers.standard.operators.empty import EmptyOperator
from datetime import datetime

with DAG(
    dag_id="empty_operator_example",
    schedule=None,
    tags=["empty"],
    start_date=datetime(2024, 1, 1),
    catchup=False,
) as dag:

    start = EmptyOperator(task_id="start")
    end = EmptyOperator(task_id="end")

    start >> end

---

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In case of fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
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In case of backwards incompatible changes please leave a note in a newsfragment file, named {pr_number}.significant.rst or {issue_number}.significant.rst, in newsfragments.

[eladkal]

It needs newsfragment as breaking change for Airflow 3

[amoghrajesh]

@eladkal aren't the other ones for example: bash operator breaking in that case too? #42252

[vincbeck]

To make migration easier for users we should have a migration rule for it