feat: remove filterTags from channel batch update API

[javierdfm]

https://linear.app/stream/issue/CHA-2504/update-sdks-and-remove-filter-tags-from-batch-api

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Note

Medium Risk
This is a breaking SDK surface change: batch operations and types no longer accept filter_tags/filter_tags_update, so existing integrations using these options will fail at type-check or runtime. Test changes are low risk but may mask backend cleanup failures by swallowing exceptions and increasing async polling timeouts.

Overview
Removes filter-tag batch operations from the channel batch updater and its type definitions: addFilterTags/removeFilterTags operations, the filter_tags filter, and filter_tags_update payload support are all deleted from ChannelBatchUpdater (sync + async) and types/channel_batch.py.

Hardens/flakiness-reduces tests by making command/user fixtures more defensive (best-effort cleanup, restoring users before upserts) and by increasing polling retries for async tasks (delete users/channels) while using await asyncio.sleep instead of blocking time.sleep in async tests.

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