refactor!: drop deprecated Material theme from all components

[web-padawan]

Description

The Material theme has been marked as deprecated in V24.8, let's remove it in V25.

Type of change

• Breaking change

[sonarqubecloud]

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 SonarQube Cloud

[sissbruecker]

There's a few leftovers, mostly in comments:

Targets
    Occurrences of 'material' in Directory /Users/sascha/dev/vaadin/web-components
Found occurrences in Directory /Users/sascha/dev/vaadin/web-components  (10 usages found)
      (2 usages found)
        DEVELOPMENT.md  (1 usage found)
            246 Run the script to bump static version getters in `ElementMixin`, `Lumo` and `Material`:
        wtr-utils.js  (1 usage found)
            21 'The Material theme is deprecated and will be removed in Vaadin 25.',
    packages/button/theme/lumo  (1 usage found)
        vaadin-button-styles.js  (1 usage found)
            236   /* Vaadin icons are based on a 16x16 grid (unlike Lumo and Material icons with 24x24), so they look too big by default */
    packages/input-container/theme/lumo  (1 usage found)
        vaadin-input-container-styles.js  (1 usage found)
            111     /* Vaadin icons are based on a 16x16 grid (unlike Lumo and Material icons with 24x24), so they look too big by default */
    packages/tabs/theme/lumo  (1 usage found)
        vaadin-tab-styles.js  (1 usage found)
            158     /* Vaadin icons are based on a 16x16 grid (unlike Lumo and Material icons with 24x24), so they look too big by default */
    packages/vaadin-themable-mixin  (2 usages found)
        register-styles.js  (1 usage found)
            9 * This is for use internally by Lumo and Material styles.
        vaadin-themable-mixin.js  (1 usage found)
            257 if (moduleName.startsWith('lumo-') || moduleName.startsWith('material-')) {
    packages/vaadin-themable-mixin/test  (3 usages found)
        themable-mixin.test.js  (3 usages found)
            158 'material-test-style-override-styles',
            327 it('material should override vaadin module styles', () => {
            335 it('should override material module styles', () => {

Probably easier to do this as a follow-up.