Give line numbers in git-grep-based lints (#53733)

Summary:
Meant to make tasks like #53728 easier. The `-n` flag enables line numbers, and the `-o` flag reduces noise by only showing the part of the line that matched (which in this case is just the trailing whitespace).

Pull Request resolved: #53733

Test Plan:
```
$ git checkout e937db5
```

Before:
```
$ (! git grep -I -l ' $' -- . ':(exclude)**/contrib/**' ':(exclude)third_party' || (echo "The above files have trailing spaces; please remove them"; false))
aten/src/ATen/native/cuda/BatchLinearAlgebra.cu
The above files have trailing spaces; please remove them
```

After:

```
$ (! git grep -I -no ' $' -- . ':(exclude)**/contrib/**' ':(exclude)third_party' || (echo "The above files have trailing spaces; please remove them"; false))
aten/src/ATen/native/cuda/BatchLinearAlgebra.cu:1972:
The above files have trailing spaces; please remove them
```

Reviewed By: mruberry

Differential Revision: D26953538

Pulled By: samestep

fbshipit-source-id: 5f7d48b79f1a02e5e5a09fe00316ec350cfc340e

Author: samestep

.github/workflows/lint.yml

@@ -42,13 +42,13 @@ jobs:
           .jenkins/run-shellcheck.sh
       - name: Ensure no trailing spaces
         run: |
-          (! git grep -I -l ' $' -- . ':(exclude)**/contrib/**' ':(exclude)third_party' || (echo "The above files have trailing spaces; please remove them"; false))
+          (! git grep -I -no ' $' -- . ':(exclude)**/contrib/**' ':(exclude)third_party' || (echo "The above files have trailing spaces; please remove them"; false))
       - name: Ensure no tabs
         run: |
-          (! git grep -I -l $'\t' -- . ':(exclude)*.svg' ':(exclude)**Makefile' ':(exclude)**/contrib/**' ':(exclude)third_party' ':(exclude).gitattributes' ':(exclude).gitmodules' || (echo "The above files have tabs; please convert them to spaces"; false))
+          (! git grep -I -no $'\t' -- . ':(exclude)*.svg' ':(exclude)**Makefile' ':(exclude)**/contrib/**' ':(exclude)third_party' ':(exclude).gitattributes' ':(exclude).gitmodules' || (echo "The above files have tabs; please convert them to spaces"; false))
       - name: Ensure canonical include
         run: |
-          (! git grep -I -l $'#include "' -- ./c10 ./aten ./torch/csrc ':(exclude)aten/src/ATen/native/quantized/cpu/qnnpack/**' || (echo "The above files have include with quotes; please convert them to #include <xxxx>"; false))
+          (! git grep -I -no $'#include "' -- ./c10 ./aten ./torch/csrc ':(exclude)aten/src/ATen/native/quantized/cpu/qnnpack/**' || (echo "The above files have include with quotes; please convert them to #include <xxxx>"; false))
       # note that this next step depends on a clean heckout;
       # if you run it locally then it will likely to complain
       # about all the generated files in torch/test