ci(tests): remove build-types jobs

Problem: Some CI jobs are redundant: `RelWithDebInfo` is already tested
on Linux-Arm64; `MinSizeRel` and Ninja Multi Config are not sufficiently
relevant in practice to spend CI cycles on.

Solution: Remove `build-types` job.

.github/workflows/test.yml

@@ -204,37 +204,6 @@ jobs:
   windows:
     uses: ./.github/workflows/test_windows.yml
 
-  # This job tests the following things:
-  # - Check if MinSizeRel and RelWithDebInfo compiles correctly.
-  # - Test the above build types with the GCC compiler specifically.
-  #   Empirically the difference in warning levels between GCC and other
-  #   compilers is particularly big.
-  # - Test if the build works with multi-config generators. We mostly use
-  #   single-config generators so it's nice to have a small sanity check for
-  #   multi-config.
-  build-types:
-    runs-on: ubuntu-24.04
-    timeout-minutes: 10
-    env:
-      CC: gcc
-    steps:
-      - uses: actions/checkout@v4
-      - uses: ./.github/actions/setup
-
-      - name: Build third-party deps
-        run: |
-          cmake -S cmake.deps -B .deps -G "Ninja Multi-Config"
-          cmake --build .deps
-
-      - name: Configure
-        run: cmake --preset ci -G "Ninja Multi-Config"
-
-      - name: RelWithDebInfo
-        run: cmake --build build --config RelWithDebInfo
-
-      - name: MinSizeRel
-        run: cmake --build build --config MinSizeRel
-
   with-external-deps:
     runs-on: ubuntu-24.04
     timeout-minutes: 10