experiment: add LitElement based version of combo-box

[web-padawan]

Description

Depends on #7185

Added LitElement based version of vaadin-combo-box and vaadin-combo-box-light.

Type of change

• Experiment

[sonarqubecloud[bot]]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

11 New issues
0 Security Hotspots
No data about Coverage
1.2% Duplication on New Code

See analysis details on SonarCloud

[sonarqubecloud[bot]]

Quality Gate failed

Failed conditions
9.1% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[vaadin-bot]

This ticket/PR has been released with Vaadin 24.4.0.alpha20 and is also targeting the upcoming stable 24.4.0 version.