Add a tools command to launch SQL validation job (#1526)

* Add a tools command to launch SQL validation job

Stopping using Pipeline.run().waitUntilFinish in
ValidateDatastorePipeline. Flex-templalate does not support blocking
wait in the main thread.

This PR adds a new ValidateSqlCommand that launches the pipeline and
maintains the SQL snapshot while the pipeline is running.

This PR also added more parameters to both ValidateSqlCommand and
ValidateDatastoreCommand:
- The -c option to supply an optional incremental comparison start time
- The -r option to supply an optional release tag that is not 'live',
  e.g., nomulus-DDDDYYMM-RC00

If the manual launch option (-m) is enabled, the commands will print the
gcloud command that can launch the pipeline.

Tested with sandbox, qa and the dev project.

core/src/main/resources/google/registry/beam/validate_database_pipeline_metadata.json

@@ -1,6 +1,6 @@
 {
-  "name": "Validate Datastore with Cloud SQL",
-  "description": "An Apache Beam batch pipeline that compares Datastore with the primary Cloud SQL database.",
+  "name": "Validate Datastore and Cloud SQL",
+  "description": "An Apache Beam batch pipeline that compares the data in Datastore and Cloud SQL database.",
   "parameters": [
     {
       "name": "registryEnvironment",

core/src/main/resources/google/registry/beam/validate_sql_pipeline_metadata.json

@@ -1,21 +0,0 @@
-{
-  "name": "Validate Cloud SQL with Datastore being primary",
-  "description": "An Apache Beam batch pipeline that compares Cloud SQL with the primary Datastore.",
-  "parameters": [
-    {
-      "name": "registryEnvironment",
-      "label": "The Registry environment.",
-      "helpText": "The Registry environment.",
-      "is_optional": false,
-      "regexes": [
-        "^PRODUCTION|SANDBOX|CRASH|QA|ALPHA$"
-      ]
-    },
-    {
-      "name": "comparisonStartTimestamp",
-      "label": "Only entities updated at or after this time are included for validation.",
-      "helpText": "The earliest entity update time allowed for inclusion in validation, in ISO8601 format.",
-      "is_optional": true
-    }
-  ]
-}