[RHIDP-5545] Added notification backend plugins

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RHDH 1.4 Release
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With this update, {product-short} includes the following dynamic plugins to manage and streamline notification delivery:

* `https://npmjs.com/package/@backstage/plugin-signals/v/0.0.11[@backstage/plugin-signals]`
* `https://npmjs.com/package/@backstage/plugin-notifications-backend/v/0.4.2[@backstage/plugin-notifications-backend]`
* `https://npmjs.com/package/@backstage/plugin-notifications/v/0.3.2[@backstage/plugin-notifications]`
* `https://npmjs.com/package/@backstage/plugin-notifications-backend-module-email/v/0.3.2[@backstage/plugin-notifications-backend-module-email]`

These plugins are disabled by default.

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With this update, {product-short} includes the following dynamic plugins to manage and streamline notification delivery: * ` https://npmjs.com/package/@backstage/plugin-signals/v/0.0.11 [@backstage/plugin-signals]` * ` https://npmjs.com/package/@backstage/plugin-notifications-backend/v/0.4.2 [@backstage/plugin-notifications-backend]` * ` https://npmjs.com/package/@backstage/plugin-notifications/v/0.3.2 [@backstage/plugin-notifications]` * ` https://npmjs.com/package/@backstage/plugin-notifications-backend-module-email/v/0.3.2 [@backstage/plugin-notifications-backend-module-email]` These plugins are disabled by default.
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Release Note Status:
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