Add cancel-button and -handler to search component

[JammingBen]

Description

We've added to possibility to have a "cancel"-button and -handler in the OcSearchBar component.

Related Issue

• Needed for https://github.com/owncloud/web/issues/7617

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Technical debt
• [ ] Tests

[AlexAndBear]

Can we have an example in the templates ?

[sonarcloud[bot]]

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