Substitute variables in path names of template repos too (#25294)

### Summary

Extend the template variable substitution to replace file paths. This
can be helpful for setting up log files & directories that should match
the repository name.

### PR Changes

 - Move files matching glob pattern when setting up repos from template
- For security, added ~escaping~ sanitization for cross-platform support
and to prevent directory traversal (thanks @silverwind for the
reference)
 - Added unit testing for escaping function 
- Fixed the integration tests for repo template generation by passing
the repo_template_id
- Updated the integration testfiles to add some variable substitution &
assert the outputs

I had to fix the existing repo template integration test and extend it
to add a check for variable substitutions.

Example:

![image](https://github.com/go-gitea/gitea/assets/12700993/621feb09-0ef3-460e-afa8-da74cd84fa4e)

tests/gitea-repositories-meta/user27/template1.git/objects/2a/83b349fa234131fc5db6f2a0498d3f4d3d6038

@@ -0,0 +1,2 @@
+x
<01><>AJ<41>0<10>a<EFBFBD>9<EFBFBD>\@Ij2<6A><32>C<EFBFBD>w<>"<22><>h<EFBFBD>i<EFBFBD><69><08>޷q<DEB7><71><EFBFBD>~<7E>{_<0C>	<1F><10><><EFBFBD>+c<>)M<><4D><EFBFBD>*rȉSD&<26><>M<EFBFBD><4D>*<2A>l<06>pm*<2A><04>5fE_<45>P<EFBFBD>8<EFBFBD><38><EFBFBD>D<EFBFBD>QC<51>ɕa<1F>
o?<3F><>+\><3E><><EFBFBD>f۸<66><DBB8><EFBFBD><EFBFBD>O<EFBFBD><4F>HH9G"x<><78>{w<><77>;<3B><>8
+i<EFBFBD>s<EFBFBD><EFBFBD><1A><><EFBFBD><EFBFBD><EFBFBD>0<EFBFBD><30><EFBFBD>9<>/<2F>

tests/gitea-repositories-meta/user27/template1.git/refs/heads/master

@@ -1 +1 @@
-aacbdfe9e1c4b47f60abe81849045fa4e96f1d75
+2a83b349fa234131fc5db6f2a0498d3f4d3d6038