Add Slicer commit date as a comment along side the SHA

The following code should be updated:

https://github.com/KitwareMedical/SlicerCustomAppTemplate/blob/05e842938f1e9c15f53a13b454efa124958aede6/%7B%7Bcookiecutter.project_name%7D%7D/CMakeLists.txt#L18

To have the following:

Before:

```
GIT_TAG b0b9be57cb7d1a1e462143ec74e3d37d271d114d
```

After:

```
GIT_TAG b0b9be57cb7d1a1e462143ec74e3d37d271d114d # 2023-03.04
```

Open {{cookiecutter.project_name}}/CMakeLists.txt at the referenced GIT_TAG entry and inspect how the Slicer commit is recorded. Update the SHA line to include the requested Slicer commit date as an inline comment, then verify the resulting line matches the issue's example.

Written by the indexing model from the issue text.