Add the option to search just by title or just by description

What does this MR do?

Add the option to search just by title or just by description

Before this, whenever a string was typed in the search box, that string was searched in both title and description. This MR adds the option of searching in just one of this fields by specifying so: * title:"title to be searched for" * description:"description to be searched for"

The name of the field (title / description) is case insensitive, so any other variations like Title or DescriPtion will work.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done