Removes debug println statements

[jmartfrut]

Removes debugging print statements and conditional code related to the injectivity check, as they are no longer needed.

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	main	ff2d32b...	main / ff2d32b...
Constitutive models/Visco-elastic Ψ	0.0516 ± 0.021 ms	0.051 ± 0.021 ms	1.01 ± 0.58
Constitutive models/Visco-elastic ∂Ψu	0.064 ± 0.005 ms	0.0631 ± 0.0047 ms	1.01 ± 0.11
Constitutive models/Visco-elastic ∂Ψuu	0.113 ± 0.015 ms	0.111 ± 0.015 ms	1.01 ± 0.19
Simulations/StaticMechanicalDirichlet	0.214 ± 0.016 s	0.208 ± 0.013 s	1.03 ± 0.1
Simulations/StaticMechanicalNeumann	0.162 ± 0.016 s	0.165 ± 0.018 s	0.982 ± 0.14
Simulations/ViscoElastic	21.6 s	21.2 s	1.02
Tensor algebra/Cofactor	0.076 ± 0.002 μs	0.064 ± 0.003 μs	1.19 ± 0.064
Tensor algebra/Det(A)Inv(A')	0.141 ± 0.021 μs	0.137 ± 0.005 μs	1.03 ± 0.16
Tensor algebra/δδ_λ_2d	19 ± 1 ns	18 ± 0 ns	1.06 ± 0.056
Tensor algebra/δδ_μ_2d	19 ± 1 ns	18 ± 1 ns	1.06 ± 0.081
time_to_load	2.33 ± 0.014 s	2.32 ± 0.011 s	1.01 ± 0.0077

Memory benchmarks

	main	ff2d32b...	main / ff2d32b...
Constitutive models/Visco-elastic Ψ	1.24 k allocs: 0.0777 MB	1.24 k allocs: 0.0777 MB	1
Constitutive models/Visco-elastic ∂Ψu	1.36 k allocs: 0.0898 MB	1.36 k allocs: 0.0898 MB	1
Constitutive models/Visco-elastic ∂Ψuu	2.32 k allocs: 0.155 MB	2.32 k allocs: 0.155 MB	1
Simulations/StaticMechanicalDirichlet	1.51 M allocs: 0.109 GB	1.51 M allocs: 0.109 GB	1
Simulations/StaticMechanicalNeumann	1.48 M allocs: 0.0933 GB	1.48 M allocs: 0.0933 GB	1
Simulations/ViscoElastic	0.343 G allocs: 22 GB	0.343 G allocs: 22 GB	1
Tensor algebra/Cofactor	1 allocs: 0.0781 kB	1 allocs: 0.0781 kB	1
Tensor algebra/Det(A)Inv(A')	4 allocs: 0.25 kB	4 allocs: 0.25 kB	1
Tensor algebra/δδ_λ_2d	0 allocs: 0 B	0 allocs: 0 B
Tensor algebra/δδ_μ_2d	0 allocs: 0 B	0 allocs: 0 B
time_to_load	0.149 k allocs: 11.1 kB	0.149 k allocs: 11.1 kB	1