maint/cicd ~ always run all GHA:Style testing steps

- always runs all style testing steps regardless of failure of the prior step
- with this change, `clippy` tests will run regardless of `fmt` test success/failure

.# [why]

The GHA:Style testing steps are essentially independent of each other and give
independent / complementary information about style issues. So, running all of
them despite errors can increase code iteration efficiency.

Note: as intended, the GHA:Style job will still fail if any individual step fails.

.github/workflows/CICD.yml

@@ -33,6 +33,7 @@ jobs:
         command: fmt
         args: --all -- --check
     - name: "`clippy` testing"
+      if: success() || failure() # run regardless of prior step ("`fmt` testing") success/failure
       uses: actions-rs/cargo@v1
       with:
         command: clippy