Add omit_channels option to userBoot

[KishanBagaria]

Allow callers to set omit_channels on client.userBoot. Needed for local-signal without loading unnecessary Slack channel data.

[Copilot]

Pull request overview

This PR extends the client.userBoot call path to allow callers to omit channel data via a new omit_channels option, supporting use cases (like local-signal) that don’t need full channel payloads.

Changes:

• Added ClientUserBootOptions to carry MinUpdated and the new OmitChannels flag.
• Updated ClientUserBootContext to delegate to a new ClientUserBootWithOptionsContext helper.
• Wired the omit_channels request parameter to opts.OmitChannels and updated min_channel_updated to use opts.MinUpdated.

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[tulir]

The test failures can be ignored

[indent]

Issues

Review closed.

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