feat(webhook): add support for dynamic placeholders in webhook URL (#1491)

* feat(wehbook): add support for dynamic placeholders in webhook URL

* refactor(webhook): rename supportPlaceholders to supportVariables and update related logic

Signed-off-by: 0xsysr3ll <0xsysr3ll@pm.me>

* feat(i18n): add missing translations

Signed-off-by: 0xsysr3ll <0xsysr3ll@pm.me>

* refactor(notifications): simplify webhook URL validation logic

Signed-off-by: 0xsysr3ll <0xsysr3ll@pm.me>

* fix: wrong docs url

Co-authored-by: Gauthier <mail@gauthierth.fr>

* fix: update webhook documentation URL to point to Jellyseerr

Signed-off-by: 0xsysr3ll <0xsysr3ll@pm.me>

---------

Signed-off-by: 0xsysr3ll <0xsysr3ll@pm.me>
Co-authored-by: Gauthier <mail@gauthierth.fr>

jellyseerr-api.yml

@@ -1451,6 +1451,9 @@ components:
               type: string
             jsonPayload:
               type: string
+            supportVariables:
+              type: boolean
+              example: false
     TelegramSettings:
       type: object
       properties: