refactor: move lambda variable scope into Physical Planning Context

[sweb]

Which issue does this PR close?

• Closes Move lambda evaluation into Physical Planning Context #23700 .

Rationale for this change

This is a clean up following #23649

What changes are included in this PR?

• Moves the lambda-variable scope state out of ExecutionProps and into PhysicalPlanningContext, following the same pattern as the scalar-subquery state in refactor: pass PhysicalPlanningContext explicitly through planner traits #23649.

• Puts PhysicalPlanningContext::indexes behind an Arc so the new per-lambda-body clone doesn't deep-copy the subquery index map. PhysicalPlanningContext::new's signature is unchanged.

Are these changes tested?

• New lambda_variables_shadow_outer_scope unit test in physical_planning_context.rs covers with_qualified_lambda_variables / lambda_variable_qualifier directly, including an inner lambda shadowing an outer parameter name.

Are there any user-facing changes?

this is a breaking change for lib users.

[github-actions]

Thank you for opening this pull request!

Reviewer note: cargo-semver-checks reported the current version number is not SemVer-compatible with the changes in this pull request (compared against the base branch).

Details

     Cloning apache/main
    Building datafusion-expr v54.1.0 (current)
       Built [  32.272s] (current)
     Parsing datafusion-expr v54.1.0 (current)
      Parsed [   0.076s] (current)
    Building datafusion-expr v54.1.0 (baseline)
       Built [  29.243s] (baseline)
     Parsing datafusion-expr v54.1.0 (baseline)
      Parsed [   0.077s] (baseline)
    Checking datafusion-expr v54.1.0 -> v54.1.0 (no change; assume patch)
     Checked [   1.279s] 223 checks: 221 pass, 2 fail, 0 warn, 30 skip

--- failure inherent_method_missing: pub method removed or renamed ---

Description:
A publicly-visible method or associated fn is no longer available under its prior name. It may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.49.0/src/lints/inherent_method_missing.ron

Failed in:
  ExecutionProps::with_qualified_lambda_variables, previously in file /home/runner/work/datafusion/datafusion/target/semver-checks/git-apache_main/2890071362773cf46bd25e60741113edced69a4d/datafusion/expr/src/execution_props.rs:145

--- failure struct_pub_field_missing: pub struct's pub field removed or renamed ---

Description:
A publicly-visible struct has at least one public field that is no longer available under its prior name. It may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.49.0/src/lints/struct_pub_field_missing.ron

Failed in:
  field lambda_variable_qualifier of struct ExecutionProps, previously in file /home/runner/work/datafusion/datafusion/target/semver-checks/git-apache_main/2890071362773cf46bd25e60741113edced69a4d/datafusion/expr/src/execution_props.rs:66

     Summary semver requires new major version: 2 major and 0 minor checks failed
    Finished [  64.098s] datafusion-expr
    Building datafusion-physical-expr v54.1.0 (current)
       Built [  30.622s] (current)
     Parsing datafusion-physical-expr v54.1.0 (current)
      Parsed [   0.052s] (current)
    Building datafusion-physical-expr v54.1.0 (baseline)
       Built [  30.965s] (baseline)
     Parsing datafusion-physical-expr v54.1.0 (baseline)
      Parsed [   0.051s] (baseline)
    Checking datafusion-physical-expr v54.1.0 -> v54.1.0 (no change; assume patch)
     Checked [   0.330s] 223 checks: 223 pass, 30 skip
     Summary no semver update required
    Finished [  63.213s] datafusion-physical-expr

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.75%. Comparing base (2f25454) to head (3b38dfa).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23989      +/-   ##
==========================================
- Coverage   80.75%   80.75%   -0.01%     
==========================================
  Files        1096     1096              
  Lines      373588   373604      +16     
  Branches   373588   373604      +16     
==========================================
+ Hits       301687   301695       +8     
- Misses      53898    53901       +3     
- Partials    18003    18008       +5     

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