Install referenced schema in "npm:validate" task

The "npm:validate" task validates the repository's `package.json` npm manifest file against its JSON schema to catch any
problems with its data format.

In order to avoid duplication of content, JSON schemas may reference other schemas via the `$ref` keyword. The
`package.json` schema was recently updated to share resources with the npm-badges configuration schema, which caused the
validation to start failing:

schema /tmp/package-json-schema-WItZVgRyuR.json is invalid
error: can't resolve reference https://json.schemastore.org/partial-eslint-plugins.json from id https://json.schemastore.org/eslintrc.json#
task: Failed to run task "npm:validate": exit status 1

The solution is to configure the workflow to download that schema as well and also to provide its path to the avj-cli
validator via a `-r` flag.

Author: per1234

Taskfile.yml

@@ -161,6 +161,10 @@ tasks:
       NPM_BADGES_SCHEMA_URL: https://json.schemastore.org/npm-badges.json
       NPM_BADGES_SCHEMA_PATH:
         sh: task utility:mktemp-file TEMPLATE="npm-badges-schema-XXXXXXXXXX.json"
+      # Source: https://github.com/SchemaStore/schemastore/blob/master/src/schemas/json/partial-eslint-plugins.json
+      PARTIAL_ESLINT_PLUGINS_SCHEMA_URL: https://json.schemastore.org/partial-eslint-plugins.json
+      PARTIAL_ESLINT_PLUGINS_PATH:
+        sh: task utility:mktemp-file TEMPLATE="partial-eslint-plugins-schema-XXXXXXXXXX.json"
       # Source: https://github.com/SchemaStore/schemastore/blob/master/src/schemas/json/prettierrc.json
       PRETTIERRC_SCHEMA_URL: https://json.schemastore.org/prettierrc.json
       PRETTIERRC_SCHEMA_PATH:
@@ -185,6 +189,7 @@ tasks:
       - wget --quiet --output-document="{{.ESLINTRC_SCHEMA_PATH}}" {{.ESLINTRC_SCHEMA_URL}}
       - wget --quiet --output-document="{{.JSCPD_SCHEMA_PATH}}" {{.JSCPD_SCHEMA_URL}}
       - wget --quiet --output-document="{{.NPM_BADGES_SCHEMA_PATH}}" {{.NPM_BADGES_SCHEMA_URL}}
+      - wget --quiet --output-document="{{.PARTIAL_ESLINT_PLUGINS_PATH}}" {{.PARTIAL_ESLINT_PLUGINS_SCHEMA_URL}}
       - wget --quiet --output-document="{{.PRETTIERRC_SCHEMA_PATH}}" {{.PRETTIERRC_SCHEMA_URL}}
       - wget --quiet --output-document="{{.SEMANTIC_RELEASE_SCHEMA_PATH}}" {{.SEMANTIC_RELEASE_SCHEMA_URL}}
       - wget --quiet --output-document="{{.STYLELINTRC_SCHEMA_PATH}}" {{.STYLELINTRC_SCHEMA_URL}}
@@ -197,6 +202,7 @@ tasks:
           -r "{{.ESLINTRC_SCHEMA_PATH}}" \
           -r "{{.JSCPD_SCHEMA_PATH}}" \
           -r "{{.NPM_BADGES_SCHEMA_PATH}}" \
+          -r "{{.PARTIAL_ESLINT_PLUGINS_PATH}}" \
           -r "{{.PRETTIERRC_SCHEMA_PATH}}" \
           -r "{{.SEMANTIC_RELEASE_SCHEMA_PATH}}" \
           -r "{{.STYLELINTRC_SCHEMA_PATH}}" \