feat: add no-padding theme variant

[FrediWa]

Description

Add the flow counterpart of https://github.com/vaadin/web-components/pull/7606 (not yet merged)

Fixes #4388

Type of change

• [ ] Bugfix
• [X] Feature

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[vaadin-bot]

This ticket/PR has been released with Vaadin 24.5.0.alpha8 and is also targeting the upcoming stable 24.5.0 version.