Add help text for YARA scan plugin fields

[anshikaagr]

Description

Added missing field-level help text to the YARA scan plugin metadata to improve guidance in the generated UI.

Changes

• Added help text for the YARA Rules Path field explaining the expected .yar / .yara rule file input.
• Added help text for the Print Matching Strings field explaining that matching strings from triggered YARA rules will be included in the scan output.
• Refreshed the plugin checksum after updating metadata.

Related Issues

Issue #536

Type of Change

• Documentation update

How Has This Been Tested?

• Verified the metadata file contains help text for all user-facing fields.
• Refreshed the plugin checksum using:

python scripts/refresh_plugin_checksum.py --plugin yara_scan

• Confirmed the metadata structure remains valid and the plugin configuration loads correctly.

Checklist

• My code follows the code style of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.