fix: labels namespace filtering in rules not working

[skynetigor]

Closes #4662

📑 Description

• Improved CEL AST Serialization: Made the CEL AST JSON-friendly by integrating Pydantic models.
• Simplified AST Structure: Removed the MethodAccess node to streamline the CEL AST structure.
• Normalized String Matching Nodes: Replaced contains, startswith, and endswith method nodes with ComparisonNode using appropriate operators.
• Read-Only Rule Display: Updated CelInput component to support read-only mode for displaying rules in the Correlation Rules table.
• Reliable AST Parsing: Replaced the buggy react-querybuilder/parseCEL with a new approach that uses CEL AST JSON to construct the QueryBuilder structure.
• Alert Query Refactor: Replaced the /alerts/search endpoint with /alerts/query for Correlation Rules.

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
keep	⬜️ Ignored (Inspect)	Visit Preview		May 5, 2025 7:12am

[codecov]

Codecov Report

Attention: Patch coverage is 78.14208% with 40 lines in your changes missing coverage. Please review.

Project coverage is 46.63%. Comparing base (2bd391e) to head (140cc0a).
Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
keep/api/core/cel_to_sql/ast_nodes.py	86.41%	11 Missing ⚠️
keep/api/core/cel_to_sql/sql_providers/base.py	75.00%	9 Missing ⚠️
...ep/api/core/cel_to_sql/sql_providers/postgresql.py	27.27%	8 Missing ⚠️
keep/api/core/cel_to_sql/cel_ast_converter.py	73.33%	4 Missing ⚠️
keep/api/core/cel_to_sql/sql_providers/mysql.py	33.33%	4 Missing ⚠️
keep/api/core/cel_to_sql/properties_mapper.py	88.88%	2 Missing ⚠️
keep/api/core/facets.py	50.00%	1 Missing ⚠️
keep/api/routes/rules.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4670      +/-   ##
==========================================
- Coverage   46.69%   46.63%   -0.07%     
==========================================
  Files         165      165              
  Lines       17005    17070      +65     
==========================================
+ Hits         7940     7960      +20     
- Misses       9065     9110      +45     

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[shahargl]

lgtm