[MAINTENANCE] Remove BaseDatasource

[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 79.54545% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 77.24%. Comparing base (1363bf7) to head (5f66834). Report is 1 commits behind head on develop.

Files	Patch %	Lines
...data_context/data_context/abstract_data_context.py	66.66%	7 Missing :warning:
...ns/data_context/data_context/cloud_data_context.py	50.00%	1 Missing :warning:
...ions/data_context/migrator/configuration_bundle.py	66.66%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9901      +/-   ##
===========================================
- Coverage    77.28%   77.24%   -0.05%     
===========================================
  Files          492      491       -1     
  Lines        42006    41817     -189     
===========================================
- Hits         32465    32300     -165     
+ Misses        9541     9517      -24     

Flag	Coverage Δ
3.10	63.53% <72.72%> (-0.21%)	:arrow_down:
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	63.53% <72.72%> (-0.21%)	:arrow_down:
3.11 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.67% <56.81%> (+0.03%)	:arrow_up:
3.11 aws_deps	44.73% <45.45%> (-0.04%)	:arrow_down:
3.11 big	54.24% <56.81%> (+0.01%)	:arrow_up:
3.11 databricks	45.91% <54.54%> (+<0.01%)	:arrow_up:
3.11 filesystem	59.02% <68.18%> (-0.16%)	:arrow_down:
3.11 mssql	48.78% <43.18%> (+0.03%)	:arrow_up:
3.11 mysql	48.83% <43.18%> (+0.03%)	:arrow_up:
3.11 postgresql	52.70% <56.81%> (+0.02%)	:arrow_up:
3.11 snowflake	46.55% <54.54%> (+<0.01%)	:arrow_up:
3.11 spark	56.29% <65.90%> (-0.01%)	:arrow_down:
3.11 trino	50.76% <54.54%> (+0.02%)	:arrow_up:
3.8	63.55% <72.72%> (-0.21%)	:arrow_down:
3.8 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.67% <56.81%> (+0.03%)	:arrow_up:
3.8 aws_deps	44.74% <45.45%> (-0.04%)	:arrow_down:
3.8 big	54.25% <56.81%> (+0.01%)	:arrow_up:
3.8 databricks	45.93% <54.54%> (+<0.01%)	:arrow_up:
3.8 filesystem	59.03% <68.18%> (-0.16%)	:arrow_down:
3.8 mssql	48.76% <43.18%> (+0.03%)	:arrow_up:
3.8 mysql	48.81% <43.18%> (+0.03%)	:arrow_up:
3.8 postgresql	52.68% <56.81%> (+0.02%)	:arrow_up:
3.8 snowflake	46.56% <54.54%> (+<0.01%)	:arrow_up:
3.8 spark	56.26% <65.90%> (-0.02%)	:arrow_down:
3.8 trino	50.74% <54.54%> (+0.02%)	:arrow_up:
3.9	63.54% <72.72%> (-0.21%)	:arrow_down:
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% <0.00%> (ø)
docs-basic	47.43% <56.81%> (+0.06%)	:arrow_up:
docs-creds-needed	48.50% <54.54%> (+0.07%)	:arrow_up:
docs-spark	47.16% <54.54%> (+0.07%)	:arrow_up:

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