refactor: replace bare dict with dict[str, Any] in response converter…

[wdeveloper16]

What this PR does

Part of #22651 — replaces bare dict annotations with dict[str, Any] in response converter modules and miscellaneous production files.

Response converters (core/app/apps/*/generate_response_converter.py):

• All 6 subclass converters + base class: Generator[dict | str, ...] → Generator[dict[str, Any] | str, ...]
• Adds Any to from typing import cast in agent_chat, chat, completion, and workflow converters

Other production files:

• core/plugin/backwards_invocation/model.py: inner handle() return type Generator[dict, ...] → Generator[dict[str, Any], ...]; adds from typing import Any
• enterprise/telemetry/metric_handler.py: attrs: dict → dict[str, Any]
• controllers/console/datasets/datasets_document.py: metadata_schema: dict = cast(dict, ...) → dict[str, Any] = cast(dict[str, Any], ...)
• controllers/console/workspace/models.py: credentials: dict → dict[str, Any]
• controllers/console/auth/activate.py: data: dict | None → dict[str, Any] | None; adds from typing import Any

Why

Bare dict is equivalent to dict[Any, Any], losing key-type information. All these dicts use string keys, so dict[str, Any] is the correct annotation and passes basedpyright strict checks.

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