Prepare main branch for 1.4

[benbrown]

Merge this AFTER we publish v1.3

This will update the nightly build branch to be 1.4-beta

[Copilot]

Pull request overview

This PR updates the project version from 1.3-beta to 1.4-beta in preparation for the next development cycle after the v1.3 release. It includes version updates, dependency cleanups, and package reference corrections in the monorepo.

Changes:

• Version bump from 1.3-beta to 1.4-beta in version.json
• Cleanup of unused dev dependencies (global, dom-walk, min-document, process, @types/express-serve-static-core)
• Correction of duplicate package reference (@microsoft/agents-copilot-studio → @microsoft/agents-copilotstudio-client)
• Reorganization of peer dependencies (@rushstack/terminal, @types/node, etc.)
• Addition of explicit dependencies across packages (agents-activity, zod, axios)

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
version.json	Version bump from 1.3-beta to 1.4-beta for the next development cycle
package-lock.json	Cleanup of unused dependencies, peer dependency reorganization, package reference corrections, and explicit dependency additions across multiple packages and samples

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