ENGCOM-5838: Add digits validation for Bulk Actions,Full Page Cache(TTL), Environment Update Time system configuration #24577

 - Merge Pull Request #24577 from ravi-chandra3197/magento2:patch-add-validation-system-configuration
 - Merged commits:
   1. b8d6ad0

Author: magento-engcom-team

app/code/Magento/AsynchronousOperations/etc/adminhtml/system.xml

@@ -13,6 +13,7 @@
                 <label>Bulk Actions</label>
                 <field id="lifetime" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="0" showInStore="0">
                     <label>Days Saved in Log</label>
+                     <validate>validate-zero-or-greater validate-digits</validate>
                 </field>
             </group>
         </section>

app/code/Magento/MediaStorage/etc/adminhtml/system.xml

@@ -28,6 +28,7 @@
                 </field>
                 <field id="configuration_update_time" translate="label" type="text" sortOrder="400" showInDefault="1" showInWebsite="0" showInStore="0" canRestore="1">
                     <label>Environment Update Time</label>
+                    <validate>validate-zero-or-greater validate-digits</validate>
                 </field>
             </group>
         </section>

app/code/Magento/PageCache/etc/adminhtml/system.xml

@@ -74,6 +74,7 @@
                 </group>
                 <field id="ttl" type="text" translate="label comment" sortOrder="5" showInDefault="1" showInWebsite="0" showInStore="0" canRestore="1">
                     <label>TTL for public content</label>
+                    <validate>validate-zero-or-greater validate-digits</validate>
                     <comment>Public content cache lifetime in seconds. If field is empty default value 86400 will be saved. </comment>
                     <backend_model>Magento\PageCache\Model\System\Config\Backend\Ttl</backend_model>
                 </field>