Add alt attribute to various images (#14405)

* ha-config-area-page: Add alt tag for area-picture

* dialog-tag-detail: Add alt tag for generated QR code image.

* ha-config-hardware: Blank alt tag for hardware pic, info already elsewhere

* dialog-energy-solar-settings: Blank alt tag for brand icon.

* ha-energy-grid-settings: Blank alt tag for co2signal brand icon.

* Add a few more appropriately-blank alt texts.

* ha-config-device-page: Logo alt text set to name of device domain.

* ha-config-repairs: Logo alt text set to name of issue domain.

* hui-picture-card(-editor): Alternate Text via config (blank default)

* hui-picture-entity-card(-editor): Alternate Text via config (blank default)

* ha-long-lived-access-token-dialog: Alt text for QR code.

* hui-picture-header-footer: Support alt text via optional property.

* A few more blank alt attributes.

* ha-tile-image: Support alt tag (but it is blank in current usage).

* prod cla-bot

* Lint. Fix whitespace.

* Add missing alt text properties to TS types.

* Fix my silly typo in picture-entity-card-editor's SCHEMA (+ minor reformat)

* Add alt_text to Picture(Entity)CardConfig TypeScript types.

* Format with prettier.

* Revise alt text for tag QR

* Revise alt text for token QR

* Revise alternate to alternative

* Add alt to logo in gallery

* Add alt text to crop image

* Use ifDefined for tile image alt

* Change area picture alt to area name

* Remove entry from entities config struct

* Revert altText changes for Picture Entity Card (to revisit in future PR)

See:
https://github.com/home-assistant/frontend/pull/14405#discussion_r1032735871

* Revert changes to hui-image and picture entity editor

Co-authored-by: Steve Repsher <steverep@users.noreply.github.com>

src/panels/config/hardware/ha-config-hardware.ts

@@ -305,7 +305,7 @@ class HaConfigHardware extends SubscribeMixin(LitElement) {
                         .twoline=${Boolean(boardId)}
                       >
                         ${imageURL
-                          ? html`<img slot="graphic" src=${imageURL} />`
+                          ? html`<img alt="" slot="graphic" src=${imageURL} />`
                           : ""}
                         <span class="primary-text">
                           ${boardName ||