samples: add presubmit lint check (#156)

* changes without context

        autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* chore(java_templates): add lint/static analysis presubmit checks for samples

* chore(java_templates): add lint/static analysis presubmit checks for samples

* chore: fix trailing whitespace

Source-Author: Jeff Ching <chingor@google.com>
Source-Date: Mon Aug 17 14:29:16 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: c3caf0704f25a0c365f1c315e804a30b87c62a75
Source-Link: googleapis/synthtool@c3caf07

* chore(java_templates): stop running pmd/spotbugs checks for samples

This was creating too much noise. We will revisit with other options and/or tune these checks.

Source-Author: Jeff Ching <chingor@google.com>
Source-Date: Wed Aug 19 12:26:49 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 9602086c6c5b05db77950c7f7495a2a3868f3537
Source-Link: googleapis/synthtool@9602086

* chore: fix line length

Co-authored-by: Jeff Ching <chingor@google.com>

document-ai/snippets/src/main/java/documentai/v1beta2/ParseWithModelBeta.java

@@ -32,7 +32,8 @@ public static void parseWithModel() throws IOException {
     // TODO(developer): Replace these variables before running the sample.
     String projectId = "your-project-id";
     String location = "your-project-location"; // Format is "us" or "eu".
-    // AutoML model name formatted as: "projects/[PROJECT_ID]/locations/[LOCATION]/models/[MODEL_ID]"
+    // AutoML model name formatted as:
+    //   "projects/[PROJECT_ID]/locations/[LOCATION]/models/[MODEL_ID]"
     String autoMlModel = "your-full-resource-model-name";
     String gcsUri = "gs://your-gcs-bucket/path/to/input/file.json";
     parseWithModel(projectId, location, autoMlModel, gcsUri);