:wheelchair: a11y(bal-modal, bal-popup): Overlay background accessible

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closes #1423

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🦋 Changeset detected

Latest commit: fc760b067354474de9b1414c0b8f533533297234

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 21 packages

| Name | Type | | -------------------------- | ----- | | @baloise/ds-core | Patch | | @baloise/ds-angular-common | Patch | | @baloise/ds-angular-legacy | Patch | | @baloise/ds-angular-module | Patch | | @baloise/ds-angular | Patch | | @baloise/ds-react | Patch | | @baloise/ds-table | Patch | | @baloise/ds-testing | Patch | | @baloise/ds-vue | Patch | | docs | Patch | | e2e | Patch | | @baloise/ds-brand-icons | Patch | | @baloise/ds-css | Patch | | @baloise/ds-devkit | Patch | | @baloise/ds-favicons | Patch | | @baloise/ds-fonts | Patch | | @baloise/ds-icons | Patch | | @baloise/ds-maps | Patch | | @baloise/ds-styles | Patch | | @baloise/ds-tokens | Patch | | @baloise/ds-nx | Patch |

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