CI upgradeapalooza `bionic`->`focal`, `gcc7`->`gcc9`, `clang7`->`clang10` (#105260)
Bionic support was finished back in April 2023, see https://ubuntu.com/blog/ubuntu-18-04-eol-for-devices
And neither gcc-7 nor clang7 are fully compatible with c++17, update minimal tested gcc to gcc9 and clang to clang-10
Note: OpenMP support is broken in Focal's `clang9`, so move up to a `clang10`
- Suppress `-Wuninitialized` in complex_test as gcc-11 fires a seemingly false-positive warning:
```
In file included from /home/malfet/git/pytorch/pytorch/c10/test/util/complex_test.cpp:1:
/home/malfet/git/pytorch/pytorch/c10/test/util/complex_test_common.h: In member function ‘virtual void memory::TestMemory_ReinterpretCast_Test::TestBody()’:
/home/malfet/git/pytorch/pytorch/c10/test/util/complex_test_common.h:38:25: warning: ‘z’ is used uninitialized [-Wuninitialized]
38 | c10::complex<float> zz = *reinterpret_cast<c10::complex<float>*>(&z);
| ^~
/home/malfet/git/pytorch/pytorch/c10/test/util/complex_test_common.h:37:25: note: ‘z’ declared here
37 | std::complex<float> z(1, 2);
| ^
```
- Downgrade `ucc` to 2.15, as 2.16 brings an incompatible libnccl, that causes crash during the initialization
- Install `pango` from condo environment for `doctr` torch bench tests to pass, as one available in the system is too new for conda
- Suppress some functorch tests when used with python-3.8+dynamo, see https://github.com/pytorch/pytorch/issues/107173
Pull Request resolved: https://github.com/pytorch/pytorch/pull/105260
Approved by: https://github.com/huydhn, https://github.com/Skylion007, https://github.com/ZainRizvi, https://github.com/seemethere
