CI: consistent naming of artifacts
Soliciting opinions on revisiting branch naming convention when we store artifacts in [ci_artifacts](https://github.com/kaitai-io/ci_artifacts). Right now, it's fairly inconsistent:

* construct/python2.7
* construct/python3.4
* construct/python3.8
* construct/python3.9
* construct/python3.10
* cpp_stl_98/clang3.5_linux
* cpp_stl_98/clang7.3_osx
* cpp_stl_98/gcc4.8
* cpp_stl_98/gcc4.8_linux
* cpp_stl_98/gcc11
* cpp_stl_98/msvc141_windows_x64
* cpp_stl_11/clang3.5_linux
* cpp_stl_11/clang7.3_osx
* cpp_stl_11/gcc4.8
* cpp_stl_11/gcc4.8_linux
* cpp_stl_11/msvc141_windows_x64
* csharp/mono5.18.0
* csharp/net45_windows
* csharp/netcore2.2.103_linux
* csharp/netcore3.0.100_linux
* go/1.10
* go/1.11
* go/1.13
* go/1.18
* go/1.19
* graphviz/2.36
* java/openjdk7
* java/openjdk11
* java/openjdk17
* java/oraclejdk8
* java/temurin8
* java/temurin11
* java/temurin17
* java/zulu7
* javascript/nodejs4
* javascript/nodejs7
* javascript/nodejs8
* javascript/nodejs10
* javascript/nodejs12
* javascript/nodejs16
* javascript/nodejs18
* lua/5.3
* nim/1.0.0
* nim/1.2.0
* nim/1.6.0
* perl/5.24
* perl/5.32
* perl/5.36
* perl/5.38
* php/7.1
* php/8.0
* php/8.2
* python/2.7
* python/3.4
* python/3.6
* python/3.8
* python/3.9
* python/3.10
* python/3.11
* ruby/1.8
* ruby/1.9
* ruby/2.3
* ruby/3.0
* ruby/3.2

Some common patterns are seen:

* For many languages, we completely ignore the OS and architecture
* For some languages, we ignore existence of alternative implementations
* For those languages where this matters, we have things like `msvc141_windows_x64` but also have `gcc4.8_linux` or `cpp_stl_11/clang7.3_osx` and `csharp/mono5.18.0` vs `csharp/netcore2.2.103_linux`.

Proposal: let's standardize everything consistently using [the approach similar to the Docker images](https://github.com/kaitai-io/kaitai_struct_docker_images#naming):

    $TARGET$SUBTARGET/$IMPLEMENTATION-$OS-$ARCH

If necessary, we can even keep track of generated artifacts history by tagging these branches prior to commit.

Cc @generalmimon?