turn on clippy rule for needless borrow

[jimexist]

Which issue does this PR close?

Closes #.

Rationale for this change

What changes are included in this PR?

• turn on warning

Are there any user-facing changes?

[codecov-commenter]

Codecov Report

Merging #545 (f14084a) into master (ad70a1e) will decrease coverage by 0.02%.
The diff coverage is 84.56%.

@@            Coverage Diff             @@
##           master     #545      +/-   ##
==========================================
- Coverage   76.13%   76.11%   -0.03%     
==========================================
  Files         156      156              
  Lines       27032    27025       -7     
==========================================
- Hits        20582    20571      -11     
- Misses       6450     6454       +4     

Impacted Files	Coverage Δ
...lista/rust/core/src/serde/logical_plan/to_proto.rs	61.41% <0.00%> (+0.07%)	⬆️
ballista/rust/executor/src/flight_service.rs	0.00% <ø> (ø)
ballista/rust/scheduler/src/state/mod.rs	70.49% <0.00%> (ø)
datafusion/src/physical_plan/expressions/case.rs	75.00% <0.00%> (-0.57%)	⬇️
...fusion/src/physical_plan/expressions/row_number.rs	81.25% <0.00%> (ø)
datafusion/src/physical_plan/repartition.rs	84.42% <ø> (-0.06%)	⬇️
benchmarks/src/bin/tpch.rs	30.84% <12.50%> (ø)
datafusion/src/execution/context.rs	92.00% <25.00%> (-0.09%)	⬇️
datafusion/src/physical_plan/windows.rs	86.46% <33.33%> (ø)
datafusion/src/physical_plan/hash_join.rs	84.89% <57.14%> (-0.63%)	⬇️
... and 23 more

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[alamb]

Thank you @jimexist !