fix: input icons and gradient legend slider improvements

[severinlandolt]

Description

This PR:

• Removes the gradients when the legend slider is activated
• Improves the icons placement and padding when input is set.

Related issue(s)

What kind of change does this PR introduce? (check at least one)

• Bug fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• New Feature (BREAKING CHANGE which adds functionality)
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

How has this been tested?

Storybook

Screenshots (if appropriate):

The PR fulfils these requirements:

• It's submitted to the main branch
• When resolving a specific issue, it's referenced in the related issue section above
• My change requires a change to the documentation. (Managed by Tremor Team)
• I have added tests to cover my changes
• Check the "Allow edits from maintainers" option while creating your PR.
• Add refs #XXX or fixes #XXX to the related issue section if your PR refers to or fixes an issue.
• By contributing to Tremor, you confirm that you have read and agreed to Tremor's CONTRIBUTING.md guideline. You also agree that your contributions will be licensed under the Apache License 2.0 license.

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Name	Status	Preview	Updated (UTC)
tremor-storybook	✅ Ready (Inspect)	Visit Preview	Feb 28, 2024 1:51am

[github-actions]

🎉 This PR is included in version 3.14.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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