Fix: consistent style an dtext on datasets list page

[nitrosx]

Applied consistent style to search buttons in datasets list. Updated buttons text

Description

This PR applies consistent style and wording to the multiple form buttons present in the datasets list page.

Motivation

The datasets list page (which is the main page where users spend most of their time) has inconsistent style and text on the multiple buttons present in the text search and filters form.

Fixes/Changes:

Please provide a list of the fixes/changes implemented in this PR

• /datasets/dashboard/full-text-search-bar.component: changed html and scss code of the search and clear button
• /datasets/datasets-filter: changed html and scss code of the search and clear button

Tests included

• Included for each change/fix?
• Passing? (Merge will not be approved unless this is checked)

Documentation

• swagger documentation updated [required] N/A
• official documentation updated [nice-to-have] N/A

official documentation info

If you have updated the official documentation, please provide PR # and URL of the pages where the updates are included

Backend version

• Does it require a specific version of the backend
• which version of the backend is required:

[Junjiequan]

The Clear Text button clears the text and refreshes all the data. In contrast, Clear All Filters only empties the filter input fields without refetching data. It merely gives a false impression of a data refetch with the page reloading and the popup success text.
I don't know would it be a problem and do we need to fix it in this PR

[nitrosx]

Behavior of Clear Text button is now consistent with the behavior of Clear All Filters one.