Add json-lint.php command to -jslint jobs

The -jslint jobs are already present on repositories having JavaScript
files and they are triggered by Zuul whenever a .json file is modified.
Hence, I guess we can make -jslint jobs to test both jshint and validate
json.

Linter introduced by https://gerrit.wikimedia.org/r/#/c/107163/

bug: 58279
Change-Id: Ied5a9c37037f1054dcf3f4c3598a617a4eced873