Validate all vars

[dnitsch]

Validate all vars inside the auth and seed actions - set in either variables or runtimeVariables.

So that

- name: create-pocketbase-user-for-qa-tes1
    endpoint: http://127.0.0.1:59886/api/users
    strategy: FIND/PATCH/POST
    getEndpointSuffix: "?page=1&perPage=100&sort=-created&filter="
    findByJsonPathExpr: "$.items[?(@.email=='qa-guy@example.com')].id"
    authMapRef: customTest1
    payloadTemplate: |
      {"email":"qa-guy@example.com","password":"Password123_alwaysChange","passwordConfirm":"Password123_alwaysChange"}
    patchPayloadTemplate: |
      {"password":"${newPass}","passwordConfirm":"${newPass}","unknown":"${unknown_var}"}
    variables:
      newPass: AWSPARAMSTR:///int-test/pocketbase/admin-pwd

an error is raised at to signify that unknown_var has no source.