feat(customizer): improve condition tree leaf typing

[DayTF]

Definition of Done

General

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• Test manually the implemented changes
• Validate the code quality (indentation, syntax, style, simplicity, readability)

Security

• Consider the security impact of the changes made

Note

Refine TConditionTreeLeaf typing to enforce operator-specific value constraints

• Introduces a discriminated union for TConditionTreeLeaf in templates.ts, splitting operators into NoValueOperator, ArrayValueOperator, NumberValueOperator, and SingleValueOperator categories so the value type is statically enforced per operator.
• Updates CollectionCustomizer and DataSourceCustomizer methods to cast generic typed definitions through unknown before passing to internal decorators, resolving type mismatches introduced by the stricter leaf typing.
• Replaces ConditionTreeLeaf constructor usage in tests with plain object literals that satisfy the new discriminated union shape.

^{Macroscope summarized 16c414f.}