Use cargo --timings to create a report about compile time for the largest CI jobs (#9906)

This uses cargo --timings to create an HTML report attached to the workflow showing all the different items in the job and how long they take to compile. For now this is only used on the build_and_test matrix.

Author: NigelBreslaw

.github/workflows/ci.yaml

@@ -112,7 +112,7 @@ jobs:
                   toolchain: ${{ matrix.rust_version }}
                   key: x-v3
             - name: Run tests
-              run:  cargo test --verbose --all-features --workspace ${{ matrix.extra_args }} ${{ matrix.maybe_exclude_bevy }} --exclude slint-node --exclude pyslint --exclude test-driver-node --exclude slint-node --exclude test-driver-nodejs --exclude test-driver-cpp --exclude mcu-board-support --exclude mcu-embassy --exclude printerdemo_mcu --exclude uefi-demo --exclude slint-cpp --exclude slint-python -- --skip=_qt::t
+              run:  cargo test --verbose --all-features --workspace --timings ${{ matrix.extra_args }} ${{ matrix.maybe_exclude_bevy }} --exclude slint-node --exclude pyslint --exclude test-driver-node --exclude slint-node --exclude test-driver-nodejs --exclude test-driver-cpp --exclude mcu-board-support --exclude mcu-embassy --exclude printerdemo_mcu --exclude uefi-demo --exclude slint-cpp --exclude slint-python -- --skip=_qt::t
               env:
                   SLINT_CREATE_SCREENSHOTS: 1
               shell: bash
@@ -124,6 +124,13 @@ jobs:
                 SLINT_LIVE_PREVIEW: 1
               run: cargo test --verbose --features=build-time,slint/live-preview -p test-driver-rust -- --skip=_qt::t
               shell: bash
+            - name: Upload build timing report
+              if: always()
+              uses: actions/upload-artifact@v4
+              with:
+                  name: cargo-timings-${{ matrix.os }}-${{ matrix.rust_version }}
+                  path: target/cargo-timings/cargo-timing.html
+                  if-no-files-found: ignore
             - name: Archive screenshots after failed tests
               if: ${{ failure() }}
               uses: actions/upload-artifact@v4