[CPU][RV64] Remove SHL library, exclude Xuantie toolchain build (#33774)

### Details:
 - Remove SHL library usage for RISC-V CPU
- Remove Xuantie toolchain usage from build (Xuantie toolchain based
RISC-V emulator is still used for testing)
- Rename toolchains for better consistency: linux_riscv (ex Xuantie) is
the main pipeline, linux_riscv_conan (ex linux_riscv)- pipeline that
checks conan build on RISC-V

### Tickets:
 - N/A

Author: aobolensk

.github/dockerfiles/docker_tag

@@ -1 +1 @@
-pr-29664
+pr-33774

.github/dockerfiles/ov_build/ubuntu_22_04_riscv/Dockerfile

@@ -13,12 +13,14 @@ ENV DEBIAN_FRONTEND="noninteractive" \
     TZ="Europe/London"
 
 RUN apt-get update && \
-    apt-get install software-properties-common && \
+    apt-get install software-properties-common wget && \
     add-apt-repository --yes --no-update ppa:git-core/ppa && \
     add-apt-repository --yes --no-update ppa:deadsnakes/ppa && \
+    add-apt-repository --yes --no-update "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main" && \
+    wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | tee /etc/apt/trusted.gpg.d/llvm.asc && \
     apt-get update && \
     # install compilers to build OpenVINO for RISC-V 64
-    apt-get install gcc-riscv64-linux-gnu g++-riscv64-linux-gnu && \
+    apt-get install gcc-riscv64-linux-gnu g++-riscv64-linux-gnu binutils-riscv64-linux-gnu && \
     apt-get install \
         curl \
         git \
@@ -40,6 +42,10 @@ RUN apt-get update && \
         # Compilers
         gcc \
         g++ \
+        # For clang-tidy validation
+        clang-format-18 \
+        clang-tidy-18 \
+        libomp-18-dev \
         && \
     rm -rf /var/lib/apt/lists/*
 
@@ -62,9 +68,19 @@ RUN echo deb [arch=amd64] http://archive.ubuntu.com/ubuntu/ jammy main restricte
 
 RUN dpkg --add-architecture riscv64 && \
     apt-get update -o Dir::Etc::sourcelist=/etc/apt/sources.list.d/riscv64-sources.list && \
-    apt-get install -y --no-install-recommends libpython3-dev:riscv64 && \
-    apt-get install libgomp1:riscv64 && \
-    apt-get install libatomic1:riscv64
+    apt-get install -y --no-install-recommends libpython3-dev:riscv64
+
+# Install sscache
+ARG SCCACHE_VERSION="v0.7.5"
+ENV SCCACHE_HOME="/opt/sccache" \
+    SCCACHE_PATH="/opt/sccache/sccache"
+
+RUN mkdir ${SCCACHE_HOME} && cd ${SCCACHE_HOME} && \
+    SCCACHE_ARCHIVE="sccache-${SCCACHE_VERSION}-x86_64-unknown-linux-musl.tar.gz" && \
+    curl -SLO https://github.com/mozilla/sccache/releases/download/${SCCACHE_VERSION}/${SCCACHE_ARCHIVE} && \
+    tar -xzf ${SCCACHE_ARCHIVE} --strip-components=1 && rm ${SCCACHE_ARCHIVE}
+
+ENV PATH="$SCCACHE_HOME:$PATH"
 
 # Setup pip
 ENV PIP_VERSION="24.0"

.github/dockerfiles/ov_build/ubuntu_22_04_riscv_xuantie/Dockerfile

@@ -69,7 +69,7 @@ jobs:
       - name: Set mock output images if pipeline should be skipped
         if: ${{ needs.smart_ci.outputs.skip_workflow == 'True' }}
         id: mock_image
-        run: echo "images={\"ov_build\":{\"ubuntu_24_04_x64\":\"mock\", \"ubuntu_22_04_arm64\":\"mock\", \"ubuntu_22_04_riscv_xuantie\":\"mock\"}}" >> "$GITHUB_OUTPUT"
+        run: echo "images={\"ov_build\":{\"ubuntu_24_04_x64\":\"mock\", \"ubuntu_22_04_arm64\":\"mock\", \"ubuntu_22_04_riscv_gnu\":\"mock\"}}" >> "$GITHUB_OUTPUT"
 
       - name: Checkout
         if: ${{ needs.smart_ci.outputs.skip_workflow != 'True' }}
@@ -82,7 +82,7 @@ jobs:
         with:
           images: |
             ov_build/ubuntu_24_04_x64
-            ov_build/ubuntu_22_04_riscv_xuantie
+            ov_build/ubuntu_22_04_riscv
           registry: 'openvinogithubactions.azurecr.io'
           dockerfiles_root_dir: '.github/dockerfiles'
           changed_components: ${{ needs.smart_ci.outputs.changed_components }}
@@ -276,7 +276,7 @@ jobs:
         shell: bash
     runs-on: aks-linux-16-cores-32gb
     container:
-      image: ${{ fromJSON(needs.docker.outputs.images).ov_build.ubuntu_22_04_riscv_xuantie }}
+      image: ${{ fromJSON(needs.docker.outputs.images).ov_build.ubuntu_22_04_riscv }}
       volumes:
         - /mount:/mount
         - /home/runner/secrets/:/secrets:ro
@@ -317,7 +317,7 @@ jobs:
         run: |
           cmake \
             -G "${{ env.CMAKE_GENERATOR }}" \
-            -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/riscv64-100-xuantie-gnu.toolchain.cmake \
+            -DCMAKE_TOOLCHAIN_FILE=cmake/toolchains/riscv64.linux.toolchain.cmake \
             -DENABLE_CLANG_TIDY=ON \
             -DENABLE_PROFILING_ITT=FULL \
             -DENABLE_DEBUG_CAPS=ON \