ci: Revert "add clang-tidy to Debian x86_64 base image"

Revert commit 0ac9ec47f6 (ci: add clang-tidy to Debian x86_64 base
image, 2022-09-20).  Our clang-tidy job runs under Fedora, and we need
the plugin to compile there anyway, so lints like IWYU will best be done
in the Fedora image.

Issue: #23912

.gitlab/ci/docker/debian10/Dockerfile

@@ -16,9 +16,6 @@ MAINTAINER Ben Boeckel <ben.boeckel@kitware.com>
 COPY install_deps.sh /root/install_deps.sh
 RUN sh /root/install_deps.sh
 
-COPY install_clang_tidy.sh /root/install_clang_tidy.sh
-RUN sh /root/install_clang_tidy.sh
-
 COPY --from=iwyu-build /root/iwyu.tar.gz /root/iwyu.tar.gz
 RUN tar -C / -xf /root/iwyu.tar.gz
 RUN ln -s /usr/lib/llvm-6.0/bin/include-what-you-use /usr/bin/include-what-you-use-6.0

.gitlab/ci/docker/debian10/install_clang_tidy.sh

@@ -1,21 +0,0 @@
-#!/bin/sh
-
-set -e
-
-# clang-tidy headers
-apt-get install -y \
-    gnupg2
-GNUPGHOME=$(mktemp -d)
-export GNUPGHOME
-keyid=6084F3CF814B57C1CF12EFD515CF4D18AF4F7421
-gpg2 --keyserver hkps://keyserver.ubuntu.com --recv-keys "$keyid"
-gpg2 -o /usr/share/keyrings/llvm.gpg --export "$keyid"
-rm -rf "$GNUPGHOME"
-unset GNUPGHOME
-echo 'deb [signed-by=/usr/share/keyrings/llvm.gpg] http://apt.llvm.org/buster/ llvm-toolchain-buster-14 main' > /etc/apt/sources.list.d/llvm.list
-apt-get update
-apt-get install -y \
-    clang-tidy-14 \
-    libclang-14-dev
-
-apt-get clean

.gitlab/os-linux.yml

@@ -45,7 +45,7 @@
 ### Debian
 
 .debian10:
-    image: "kitware/cmake:ci-debian10-x86_64-2022-09-22"
+    image: "kitware/cmake:ci-debian10-x86_64-2022-08-30"
 
     variables:
         GIT_CLONE_PATH: "$CI_BUILDS_DIR/cmake ci"