Fix treatment of "#" in S3Hook.parse_s3_url()

[GlenboLake]

Apache Airflow version

2.8.4 in my environment, but the issue is still present in main

What happened

A client submitted an S3 file to my workflow with an octothorpe in the filename, essentially s3://my-bucket/path/to/key/email campaign - PO# 123456_REPORT.csv. When my Airflow DAG tried to parse this URL, part of the filename was lost:

>>> s3_key = 's3://my-bucket/path/to/key/email campaign - PO# 123456_REPORT.csv'
>>> S3Hook.parse_s3_url(s3_key)
('my-bucket', 'path/to/key/email campaign - PO')

What you think should happen instead

The key should not be truncated. The result of the above example should be ('my-bucket', 'path/to/key/email campaign - PO# 123456_REPORT.csv')

How to reproduce:

Call S3Hook.parse_s3_url() with a # character in the S3 URL. Everything after the # is lost, because urllib.parse.urlsplit() is current called with the default option allow_fragments=True.

This PR passes allow_fragments=False to urlsplit to prevent this error. As far as I can tell, there are no valid cases of # in an S3 key being treated as a fragment, and no existing GitHub issue to fix this.

Operating System

Ubuntu 22.04

Versions of Apache Airflow Providers

Provider	Version
apache-airflow-providers-amazon	8.20.0
apache-airflow-providers-celery	3.6.2
apache-airflow-providers-common-io	1.3.1
apache-airflow-providers-common-sql	1.12.0
apache-airflow-providers-ftp	3.8.0
apache-airflow-providers-http	4.10.1
apache-airflow-providers-imap	3.5.0
apache-airflow-providers-postgres	5.10.2
apache-airflow-providers-sendgrid	3.4.0
apache-airflow-providers-sftp	4.9.1
apache-airflow-providers-smtp	1.6.1
apache-airflow-providers-sqlite	3.7.1
apache-airflow-providers-ssh	3.10.1

Deployment

This may be reproduced without deploying

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[boring-cyborg]

Congratulations on your first Pull Request and welcome to the Apache Airflow community! If you have any issues or are unsure about any anything please check our Contributors' Guide (https://github.com/apache/airflow/blob/main/contributing-docs/README.rst)
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[vincbeck]

Love it!

[vincbeck]

Static checks are failing, running the pre-commit should auto resolve them

[eladkal]

static tests are failing

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.