DOM-42841 Removing beta messaging on datasource_client instantiation

[ddl-aj-rossman]

Description

Removing beta messaging from sdk on instantiation of datasource_client. Will be removing environment variable from nucleus next:)

Shouldn't go in 5.5 release FYI

https://dominodatalab.atlassian.net/browse/DOM-42841

Related Issue

Do it!

Type of Change

• 📚 Examples / docs / tutorials / dependencies update
• 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix

Checklist

• I've read the CONTRIBUTING.md guide.
• I've updated the code style using make codestyle.
• I've written tests for all new methods and classes that I created.
• I've written the docstring in Google format for all the methods and classes that I used.

[github-actions]

✅ Result of Pytest Coverage

---------- coverage: platform linux, python 3.9.16-final-0 -----------

Name	Stmts	Miss	Cover
domino_data/init.py	7	2	71%
domino_data/_feature_store/init.py	0	0	100%
domino_data/_feature_store/client.py	41	3	93%
domino_data/_feature_store/exceptions.py	9	0	100%
domino_data/_feature_store/git.py	43	1	98%
domino_data/_feature_store/logging.py	7	0	100%
domino_data/_feature_store/run.py	16	16	0%
domino_data/_feature_store/sync.py	98	9	91%
domino_data/auth.py	84	12	86%
domino_data/configuration_gen.py	164	0	100%
domino_data/data_sources.py	260	14	95%
domino_data/logging.py	10	0	100%
domino_data/training_sets/init.py	0	0	100%
domino_data/training_sets/client.py	126	10	92%
domino_data/training_sets/model.py	42	0	100%
TOTAL	907	67	93%

~ 55 passed in 21.30s ~