[DOCS] Remove Instances of Test Connection from the GX Cloud Docs

[kwcanuck]

The Test connection option has been removed as an optional selection when creating a Data Source in GX Cloud. This PR implements the necessary documentation changes.

Definition of done

• PR title is prefixed with one of: [BUGFIX], [FEATURE], [DOCS], [MAINTENANCE], [CONTRIB]
• Appropriate tests and docs have been updated

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.51%. Comparing base (c716838) to head (5ba5f30).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #9815   +/-   ##
========================================
  Coverage    82.51%   82.51%           
========================================
  Files          504      504           
  Lines        45079    45079           
========================================
  Hits         37199    37199           
  Misses        7880     7880           

Flag	Coverage Δ
3.10	65.64% <ø> (ø)
3.10 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	?
3.10 aws_deps	?
3.10 big	?
3.10 databricks	?
3.10 filesystem	?
3.10 mssql	?
3.10 mysql	?
3.10 postgresql	?
3.10 snowflake	?
3.10 spark	?
3.10 trino	?
3.11	65.64% <ø> (ø)
3.11 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.30% <ø> (ø)
3.11 aws_deps	44.22% <ø> (ø)
3.11 big	61.08% <ø> (ø)
3.11 databricks	45.26% <ø> (ø)
3.11 filesystem	62.53% <ø> (ø)
3.11 mssql	47.98% <ø> (ø)
3.11 mysql	48.04% <ø> (ø)
3.11 postgresql	51.69% <ø> (ø)
3.11 snowflake	45.85% <ø> (ø)
3.11 spark	57.85% <ø> (ø)
3.11 trino	51.01% <ø> (ø)
3.8	65.65% <ø> (ø)
3.8 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.31% <ø> (ø)
3.8 aws_deps	44.24% <ø> (ø)
3.8 big	61.08% <ø> (ø)
3.8 databricks	45.28% <ø> (ø)
3.8 filesystem	62.54% <ø> (ø)
3.8 mssql	47.97% <ø> (ø)
3.8 mysql	48.02% <ø> (ø)
3.8 postgresql	51.68% <ø> (ø)
3.8 snowflake	45.87% <ø> (ø)
3.8 spark	57.80% <ø> (ø)
3.8 trino	51.00% <ø> (ø)
3.9	65.65% <ø> (ø)
3.9 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	?
3.9 aws_deps	?
3.9 big	?
3.9 databricks	?
3.9 filesystem	?
3.9 mssql	?
3.9 mysql	?
3.9 postgresql	?
3.9 snowflake	?
3.9 spark	?
3.9 trino	?
cloud	0.00% <ø> (ø)
docs-basic	51.91% <ø> (ø)
docs-creds-needed	53.00% <ø> (ø)
docs-spark	51.67% <ø> (ø)

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[Rachel-Reverie]

LGTM

[roblim]

LGTM!