chore: [Spanner] adjust initial_poll_delay for CreateDatabase and UpdateDatabaseDdl LRO operations (googleapis#8853)

* chore: adjust initial_poll_delay for CreateDatabase and UpdateDatabaseDdl LRO operations

PiperOrigin-RevId: 853884590

Source-Link: googleapis/googleapis@136a2c4

Source-Link: https://github.com/googleapis/googleapis-gen/commit/d96d296df50b50ed4018bcd402399593b1bfb45a
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Spanner/src/Admin/Database/V1/resources/database_admin_descriptor_config.php

@@ -65,7 +65,7 @@
                 'longRunning' => [
                     'operationReturnType' => '\Google\Cloud\Spanner\Admin\Database\V1\Database',
                     'metadataReturnType' => '\Google\Cloud\Spanner\Admin\Database\V1\CreateDatabaseMetadata',
-                    'initialPollDelayMillis' => '20000',
+                    'initialPollDelayMillis' => '1000',
                     'pollDelayMultiplier' => '1.5',
                     'maxPollDelayMillis' => '45000',
                     'totalPollTimeoutMillis' => '86400000',
@@ -123,7 +123,7 @@
                 'longRunning' => [
                     'operationReturnType' => '\Google\Protobuf\GPBEmpty',
                     'metadataReturnType' => '\Google\Cloud\Spanner\Admin\Database\V1\UpdateDatabaseDdlMetadata',
-                    'initialPollDelayMillis' => '20000',
+                    'initialPollDelayMillis' => '1000',
                     'pollDelayMultiplier' => '1.5',
                     'maxPollDelayMillis' => '45000',
                     'totalPollTimeoutMillis' => '86400000',