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>ÎAJÅ0€a×9Å\@Ij2™ÂCÞwž"™Ìh±i¥<69>ÞÞ·qïö‡~Þ{_¦	ì<10>çæ+cÔ)M<>•³*rȉSD&’ŠM³û*‡l¥pm*³Ž5fE_ªP 8û˜´D™QCËÉ•aû
o?«À+\>ÛèûfÛ¸¾÷²¬O¼÷HH9G"xôÑ{w¯÷;“ÿ8
+iþsîÖœ£ž¶Ø0<C398>ï²9Ý/å

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

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