Add option to show less facet values

[josegar74]

Currently the facet filters allow to display more values, but doesn't allow to reduce the number of values listed, unless refreshing the full page.

This change adds a less option to reduce the list to the previous number of elements.

Previously:

With the change:

Checklist

• I have read the [contribution guidelines](https://github.com/geonetwork/core-geonetwork/blob/main/CONTRIBUTING.md
• Pull request provided for main branch, backports managed with label
• Good housekeeping of code, cleaning up comments, tests, and documentation
• Clean commit history broken into understandable chucks, avoiding big commits with hundreds of files, cautious of reformatting and whitespace changes
• Clean commit messages, longer verbose messages are encouraged
• API Changes are identified in commit messages
• Testing provided for features or enhancements using automatic tests)
• User documentation provided for new features or enhancements in manual
• Build documentation provided for development instructions in README.md files
• Library management using pom.xml dependency management. Update build documentation with intended library use and library tutorials or documentation

[MichelGabriel]

@josegar74 if you could add an extra class on line 139 in facets.html that would make it perfect.

Then it will look like this:
class="gn-facet-more d-inline-block"

This will remove the underline on hover be too wide.

[josegar74]

@MichelGabriel added the style, thanks for the review.