[MAINTENANCE] Remove context root directory search logic within `SerializableDataContext`

[cdkini]

In 0.18.x, the context would search up to 4 levels up in a file/directory structure to find a GX project. This feels a bit too magical and results in difficult to diagnose bugs.

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

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Codecov Report

Attention: Patch coverage is 90.90909% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 77.32%. Comparing base (ed3b5b4) to head (77e1774).

Files	Patch %	Lines
..._context/data_context/serializable_data_context.py	90.90%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9904      +/-   ##
===========================================
+ Coverage    77.28%   77.32%   +0.03%     
===========================================
  Files          492      492              
  Lines        42006    41971      -35     
===========================================
- Hits         32465    32453      -12     
+ Misses        9541     9518      -23     

Flag	Coverage Δ
3.10	63.75% <54.54%> (+0.02%)	:arrow_up:
3.11	63.75% <54.54%> (+0.02%)	:arrow_up:
3.11 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.66% <18.18%> (+0.02%)	:arrow_up:
3.11 aws_deps	44.77% <54.54%> (+<0.01%)	:arrow_up:
3.11 big	54.24% <54.54%> (+0.01%)	:arrow_up:
3.11 databricks	45.93% <18.18%> (+0.02%)	:arrow_up:
3.11 filesystem	59.19% <90.90%> (+0.02%)	:arrow_up:
3.11 mssql	48.77% <18.18%> (+0.02%)	:arrow_up:
3.11 mysql	48.82% <18.18%> (+0.02%)	:arrow_up:
3.11 postgresql	52.70% <18.18%> (+0.02%)	:arrow_up:
3.11 snowflake	46.56% <18.18%> (+0.02%)	:arrow_up:
3.11 spark	56.33% <18.18%> (+0.03%)	:arrow_up:
3.11 trino	50.76% <18.18%> (+0.02%)	:arrow_up:
3.8	63.77% <54.54%> (+0.02%)	:arrow_up:
3.8 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.67% <18.18%> (+0.02%)	:arrow_up:
3.8 aws_deps	44.79% <54.54%> (+<0.01%)	:arrow_up:
3.8 big	54.25% <54.54%> (+0.01%)	:arrow_up:
3.8 databricks	45.94% <18.18%> (+0.02%)	:arrow_up:
3.8 filesystem	59.20% <90.90%> (+0.02%)	:arrow_up:
3.8 mssql	48.75% <18.18%> (+0.02%)	:arrow_up:
3.8 mysql	48.81% <18.18%> (+0.02%)	:arrow_up:
3.8 postgresql	52.68% <18.18%> (+0.02%)	:arrow_up:
3.8 snowflake	46.57% <18.18%> (+0.01%)	:arrow_up:
3.8 spark	56.30% <18.18%> (+0.03%)	:arrow_up:
3.8 trino	50.74% <18.18%> (+0.02%)	:arrow_up:
3.9	63.77% <54.54%> (+0.02%)	:arrow_up:
cloud	0.00% <0.00%> (ø)
docs-basic	47.38% <90.90%> (+0.01%)	:arrow_up:
docs-creds-needed	48.43% <90.90%> (+0.01%)	:arrow_up:
docs-spark	47.10% <90.90%> (+0.01%)	:arrow_up:

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