Add Conditional Handling for H2SQL Databases and Improve Database Compatibility (#2632)

# Description

1. **Conditional Support for DatabaseController**:
- The `DatabaseController` is now annotated with
`@Conditional(H2SQLCondition.class)` to ensure it is only available for
H2SQL database setups.
- This prevents unnecessary exposure of endpoints when the application
is configured for H2SQL.

2. **Database Web Template Adjustments**:
- The UI elements related to database management are conditionally
hidden when the database type is not supported (e.g., `databaseVersion
== 'Unknown'`).
- Improves user experience by avoiding unsupported operations for
non-H2SQL or unknown databases.

3. **Model Attribute Updates**:
- Added a check in `DatabaseWebController` to set an informational
message (`notSupported`) when the database version is unknown.

4. **H2 Database Compatibility**:
- Additional adjustments to ensure the application gracefully handles
H2-specific functionality without affecting other database
configurations.

5. **Build File Updates**:
- Updated the `build.gradle` file to exclude `H2SQLCondition` and
related controllers when specific configurations (e.g., security or
database type) are disabled.

### Benefits:
- Enhances application flexibility by adapting to the configured
database type.
- Improves user feedback with clear messaging and UI adjustments for
unsupported operations.
- Prevents accidental exposure of database endpoints in H2SQL setups.

## Checklist

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have performed a self-review of my own code
- [ ] I have attached images of the change if it is UI based
- [x] I have commented my code, particularly in hard-to-understand areas
- [ ] If my code has heavily changed functionality I have updated
relevant docs on [Stirling-PDFs doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
- [x] My changes generate no new warnings
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

src/main/java/stirling/software/SPDF/controller/api/H2SQLCondition.java

@@ -0,0 +1,19 @@
+package stirling.software.SPDF.controller.api;
+
+import org.springframework.context.annotation.Condition;
+import org.springframework.context.annotation.ConditionContext;
+import org.springframework.core.type.AnnotatedTypeMetadata;
+
+public class H2SQLCondition implements Condition {
+
+    @Override
+    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
+        boolean enableCustomDatabase =
+                Boolean.parseBoolean(
+                        context.getEnvironment()
+                                .getProperty("system.datasource.enableCustomDatabase"));
+        String dataSourceType = context.getEnvironment().getProperty("system.datasource.type");
+        return !enableCustomDatabase
+                || (enableCustomDatabase && "h2".equalsIgnoreCase(dataSourceType));
+    }
+}