[MAINTENANCE] Remove DatasourceConfig

[tyler-hoffman]

• [ ] Description of PR changes above includes a link to an existing GitHub issue
• [ ] PR title is prefixed with one of: [BUGFIX], [FEATURE], [DOCS], [MAINTENANCE], [CONTRIB]
• [ ] Code is linted - run invoke lint (uses ruff format + ruff check)
• [ ] Appropriate tests and docs have been updated

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 65.00000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 77.33%. Comparing base (4b7aec0) to head (82bd7f5).

Files	Patch %	Lines
...xpectations/data_context/store/datasource_store.py	66.66%	6 Missing :warning:
...ata_context/data_context/ephemeral_data_context.py	0.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9916      +/-   ##
===========================================
+ Coverage    77.24%   77.33%   +0.09%     
===========================================
  Files          491      490       -1     
  Lines        41817    41659     -158     
===========================================
- Hits         32300    32218      -82     
+ Misses        9517     9441      -76     

Flag	Coverage Δ
3.10	63.57% <65.00%> (+0.04%)	:arrow_up:
3.11	63.57% <65.00%> (+0.04%)	:arrow_up:
3.11 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.68% <25.00%> (+0.01%)	:arrow_up:
3.11 aws_deps	44.71% <25.00%> (-0.02%)	:arrow_down:
3.11 big	54.26% <25.00%> (+0.02%)	:arrow_up:
3.11 databricks	45.90% <25.00%> (-0.02%)	:arrow_down:
3.11 filesystem	59.06% <25.00%> (+0.04%)	:arrow_up:
3.11 mssql	48.78% <25.00%> (+<0.01%)	:arrow_up:
3.11 mysql	48.83% <25.00%> (+<0.01%)	:arrow_up:
3.11 postgresql	52.71% <25.00%> (+0.01%)	:arrow_up:
3.11 snowflake	46.54% <25.00%> (-0.01%)	:arrow_down:
3.11 spark	56.32% <65.00%> (+0.02%)	:arrow_up:
3.11 trino	50.77% <25.00%> (+<0.01%)	:arrow_up:
3.8	63.59% <65.00%> (+0.04%)	:arrow_up:
3.8 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.69% <25.00%> (+0.01%)	:arrow_up:
3.8 aws_deps	44.73% <25.00%> (-0.02%)	:arrow_down:
3.8 big	54.27% <25.00%> (+0.02%)	:arrow_up:
3.8 databricks	45.92% <25.00%> (-0.01%)	:arrow_down:
3.8 filesystem	59.07% <25.00%> (+0.04%)	:arrow_up:
3.8 mssql	48.76% <25.00%> (+<0.01%)	:arrow_up:
3.8 mysql	48.82% <25.00%> (+<0.01%)	:arrow_up:
3.8 postgresql	52.70% <25.00%> (+0.01%)	:arrow_up:
3.8 snowflake	46.56% <25.00%> (-0.01%)	:arrow_down:
3.8 spark	56.28% <65.00%> (+0.02%)	:arrow_up:
3.8 trino	50.75% <25.00%> (+<0.01%)	:arrow_up:
3.9	63.59% <65.00%> (+0.04%)	:arrow_up:
cloud	0.00% <0.00%> (ø)
docs-basic	47.43% <25.00%> (-0.01%)	:arrow_down:
docs-creds-needed	48.50% <25.00%> (+<0.01%)	:arrow_up:
docs-spark	47.16% <25.00%> (-0.01%)	:arrow_down:

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