chore: apply static type checks on celery async task dispatches and imports

[bowenliang123]

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Summary

• to close missing type checks on celery async task and imports #24417
• install celery-types lib for stubs of celery and related libraires
• bump mypy to 1.17
• correct the setting of task_ignore_result config from Celery app initialisation to config updates
• and fix the following errors in mypy checks after installing celery-types lib

extensions/ext_celery.py:64: error: Unexpected keyword argument "task_ignore_result" for "Celery"  [call-arg]
services/webapp_auth_service.py:77: error: Argument "language" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:442: error: Argument "language" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:470: error: Argument "language" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:473: error: Argument "phase" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:490: error: Argument "language" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:514: error: Argument "language" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:517: error: Argument "workspace" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:536: error: Argument "language" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:538: error: Argument "workspace" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:539: error: Argument "new_owner_email" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:555: error: Argument "language" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:557: error: Argument "workspace" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:651: error: Argument "language" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
services/account_service.py:1266: error: Argument "language" to "delay" of "Task" has incompatible type "str | None"; expected "str"  [arg-type]
events/event_handlers/clean_when_document_deleted.py:11: error: Argument 2 to "delay" of "Task" has incompatible type "Any | None"; expected "str"  [arg-type]
events/event_handlers/clean_when_document_deleted.py:11: error: Argument 3 to "delay" of "Task" has incompatible type "Any | None"; expected "str"  [arg-type]

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods