Remove replyToId for Direct Line Speech adapter

[compulim]

Fixes #3773

Changelog Entry

Fixes

• Fixes #3773. Remove replyToId when using Direct Line Speech adapter, by @compulim in PR #3776

Description

Direct Line Speech adapter does not provide send receipt or any form of ACKs. The replyToId will always point to an activity outside of the transcript. Thus, a delay will always be introduced (for accessibility reasons).

Since receipts or send ACKs are not supported, we could remove the replyToId to prevent accessibility work to introduce the delay of showing activities.

Design

Specific Changes

• Update Direct Line Speech chat adapter to remove replyToId for all incoming activities
• Added tests to make sure 2 consecutive messages sent are received in a timely manner.

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)

[corinagum]

LGTM - wondering if we'll need to do a cherrypick