Enable -Wunique-object-duplication inside templated code (#125902) Followup to #125526. This allows the unique object duplication warning to fire on code inside of templates. Previously, it was disabled there to prevent false positives if the template was never instantiated. The patch has two parts: first, we move the check from `FinalizeDeclaration` (which is only called during parsing) to `CheckCompleteVariableDeclaration` (which is also called during template instantiation). Since the code we're moving is fairly bulky, we abstract it into a separate function for convenience. Second, we disable the warning during template parsing, and add a check later to see if the variable we're acting on on originated from a template. If so, it has the potential to be duplicated just like an inline variable. ## Testing Unit tests for template have been added to the existing test suite. To evaluate the patch on real code, I ran it on chromium and on clang itself. As expected, in both cases we got strictly more warnings than before. I manually looked through each new warning, and they all seemed legitimate. In chromium, we found [79 new warnings across 55 files](https://github.com/user-attachments/files/18676635/new_warnings_chromium.txt), mostly in third-party code (for a total of 234 warnings across 137 files). In clang, we found [8 new warnings across 6 files](https://github.com/user-attachments/files/18676658/new_warnings_clang.txt), for a total of 17 warnings across 11 files.
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