Revert "check for changed .rs files before semver checks" (#168)

This reverts commit fcb17a1 (part of
#165).

The change (intended at speeding things up) is over-eager, and makes the
entire semver-checks workflow ineffective. By reverting it out, we make
sure that we are actually using the more effective version. At some
point in the future, I might try to bring back some version of this to
speed things up.

Author: jaybosamiya-ms

.github/workflows/semver-checks.yml

@@ -25,30 +25,15 @@ jobs:
         uses: actions/checkout@v4
       - name: Ensure that the main branch is fetched
         run: git fetch origin main:main
-      - name: Check for changed .rs files
-        id: check_rs_changes
-        run: |
-          git fetch origin main:main
-          CHANGED_RS_FILES=$(git diff --name-only origin/main...HEAD | grep '\.rs$' || true)
-          echo "Changed .rs files:"
-          echo "$CHANGED_RS_FILES"
-          if [ -z "$CHANGED_RS_FILES" ]; then
-            echo "rs_changes=false" >> "$GITHUB_OUTPUT"
-          else
-            echo "rs_changes=true" >> "$GITHUB_OUTPUT"
-          fi
       - name: Set up Rust
-        if: steps.check_rs_changes.outputs.rs_changes == 'true'
         run: |
           rustup toolchain install $(awk -F'"' '/channel/{print $2}' rust-toolchain.toml) --profile minimal --no-self-update
       - name: Set up cargo-semver-checks
-        if: steps.check_rs_changes.outputs.rs_changes == 'true'
         run: |
           curl -L --proto '=https' --tlsv1.2 -sSf https://github.com/obi1kenobi/cargo-semver-checks/releases/latest/download/cargo-semver-checks-x86_64-unknown-linux-gnu.tar.gz | tar xzvf -
           mv cargo-semver-checks ~/.cargo/bin
       - name: Check semver match against the main branch
         id: semver_check
-        if: steps.check_rs_changes.outputs.rs_changes == 'true'
         run: |
           # TODO(jayb): we are temporarily preventing a failure in semver-checks
           # from showing up as a `X`, but instead triggering a comment on the