split _CI GHA into two to save on time

[maloel]

This adds 2 more jobs (one Windows, one Linux), but improves total runtime by ~10 minutes:
On Linux, 35 minutes (Shared) -> down to 25 (Static)
On Windows, 44 minutes (Static) -> down to 27 (Shared with DDS) and 34 (Static, without DDS - with executables)

The unit-test executables really hurt.

[Nir-Az]

CI failed..

[maloel]

CI failed..

Not in our code, and I haven't changed any C++ code...

[100%] Linking CXX shared library pyrealsense2.cpython-38-x86_64-linux-gnu.so
lto1: internal compiler error: in add_symbol_to_partition_1, at lto/lto-partition.c:153
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-9/README.Bugs> for instructions.
lto-wrapper: fatal error: /usr/bin/c++ returned 1 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed

I'll rebase and try again, don't know what's causing this.

[Nir-Az]

CI failed..

Not in our code, and I haven't changed any C++ code...

[100%] Linking CXX shared library pyrealsense2.cpython-38-x86_64-linux-gnu.so
lto1: internal compiler error: in add_symbol_to_partition_1, at lto/lto-partition.c:153
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-9/README.Bugs> for instructions.
lto-wrapper: fatal error: /usr/bin/c++ returned 1 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed

I'll rebase and try again, don't know what's causing this.

Looks like we have issues compiling on newer compilers..
Link Time Optimization issues.
Setting the compiler as GCC7 works but I'm not sure it's the right solution
Checking..

[Nir-Az]

My PR is ready but it will conflict with yours
#11627
It should fix the errors you see.
Should I merge first? (You will have to do the same as I did for your new builds)

[maloel]

My PR is ready but it will conflict with yours #11627

I don't see that it would conflict, you just changed the _LiveTests steps, no?
You do yours first, I'll update if needed.

[Nir-Az]

I suggest aligning the compiler to GCC7 like in other U20 builds

[maloel]

Looks good now, thx