feat!: run linters against the workspace

- Run jscpd, gitleaks, textlint  against the entire workspace instead of
  running them over single files, one by one.
- Implement a warning function for deprecated variables.
- Deprecate the VALIDATE_JSCPD_ALL_CODEBASE variable.
- Remove duplicate configuration files when they are the same as the
  ones we provide in TEMPLATES.
- Add a missing tests for ansible-lint.
- Move ANSIBLE_DIRECTORY configuration when running tests in
  buildFileList, where similar configs are.
- Simplify ansible-lint test cases to include only what's necessary, and
  not an entire set of roles, playbooks, and inventory.
- Write instructions about major upgrades in the upgrade guide.

.github/linters/.jscpd-test-linters.json

@@ -0,0 +1,10 @@
+{
+  "absolute": true,
+  "ignore": [
+    "**/node_modules/**"
+  ],
+  "reporters": [
+    "consoleFull"
+  ],
+  "threshold": 0
+}

.github/linters/.jscpd.json

@@ -1,6 +1,39 @@
 {
   "absolute": true,
   "ignore": [
+    "**/ISSUE_TEMPLATE/bug_report.yml",
+    "**/ISSUE_TEMPLATE/feature_request.yml",
+    "**/node_modules/**",
+    "**/test/linters/ansible/**",
+    "**/test/linters/clojure",
+    "**/test/linters/cloudformation",
+    "**/test/linters/coffeescript",
+    "**/test/linters/css",
+    "**/test/linters/html",
+    "**/test/linters/javascript_es",
+    "**/test/linters/javascript_prettier",
+    "**/test/linters/javascript_standard",
+    "**/test/linters/jscpd/bad",
+    "**/test/linters/latex",
+    "**/test/linters/perl",
+    "**/test/linters/php_builtin",
+    "**/test/linters/php_phpcs",
+    "**/test/linters/php_phpstan",
+    "**/test/linters/php_psalm",
+    "**/test/linters/protobuf",
+    "**/test/linters/python_black",
+    "**/test/linters/python_flake8",
+    "**/test/linters/python_isort",
+    "**/test/linters/python_mypy",
+    "**/test/linters/python_pylint",
+    "**/test/linters/r",
+    "**/test/linters/ruby",
+    "**/test/linters/rust_2015",
+    "**/test/linters/rust_2018",
+    "**/test/linters/rust_2021",
+    "**/test/linters/scalafmt",
+    "**/test/linters/tekton/**",
+    "**/test/linters/typescript_es/**",
     "**/workflows/cd.yml"
   ],
   "reporters": [