Improve error message when absolute path is not used (#19666)
Closes #19656
### Summary of the issue:
Python 3.13 improved absolute path detection to make it more accurate.
`%homepath%` expands to `Users\username` not `C:\Users\username`, so it
is not an absolute path.
However before Python 3.13, it was treated as an absolute path.
The dialog to warn the user about absolute paths doesn't include the
expanded path, so users unaware of what `%homepath%` does won't
understand why it's not being treated as an absolute path.
### Description of user facing changes:
Include the expanded path in the warning dialog.
This ensures users understand why their path may be invalid.
### Description of developer facing changes:
None
### Description of development approach:
Add path to dialog
### Testing strategy:
Test creating a portable copy with `%homepath%`
### Known issues with pull request:
none
