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/resources/templates/database.html

@@ -18,7 +18,7 @@
               </div>
               <p th:if="${error}" th:text="#{'database.' + ${error}}" class="alert alert-danger text-center"></p>
               <p th:if="${infoMessage}" th:text="#{'database.' + ${infoMessage}}" class="alert alert-success text-center"></p>
-              <div class="bg-card mt-3 mb-3">
+              <div th:if="${databaseVersion!='Unknown'}" class="bg-card mt-3 mb-3">
                 <table class="table table-striped table-hover mb-0">
                   <thead>
                     <tr>
@@ -45,7 +45,7 @@
                 <a th:title="#{database.createBackupFile}" th:text="#{database.createBackupFile}" th:href="@{'/api/v1/database/createDatabaseBackup'}" class="btn btn-outline-primary">Create Backup File</a>
               </div>
               <hr>
-              <form th:action="@{'/api/v1/database/import-database'}" method="post" enctype="multipart/form-data" class="bg-card mt-3 mb-3">
+              <form th:if="${databaseVersion!='Unknown'}" th:action="@{'/api/v1/database/import-database'}" method="post" enctype="multipart/form-data" class="bg-card mt-3 mb-3">
                 <div style="background: var(--md-sys-color-error-container);border-radius: 2rem;" class="mb-3 p-3">
                   <p th:text="#{database.info_1}"></p>
                   <p th:text="#{database.info_2}"></p>