build: don't use lint-ci on Travis

The `lint-ci` Makefile target differs from `lint` in that it writes to
a tap file and not stdout and also stops execution when an error is
found (e.g. if JavaScript linting fails the C++ and docs linting are
not run).

The switch to `lint-ci` was to enable Python linting. Revert to `lint`
and add the `lint-py` target.

PR-URL: #27062
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>

.travis.yml

@@ -18,7 +18,7 @@ jobs:
       install:
         - make lint-py-build || true
       script:
-        - NODE=$(which node) make lint-ci
+        - NODE=$(which node) make lint lint-py
 
     - name: "Compile V8"
       language: cpp