Set versionHeightOffset to -2 in core version.json files

[singhk97]

Summary

• Set versionHeightOffset to -2 in core/version.json (was -1).
• Add versionHeightOffset: -2 to core/src/Microsoft.Teams.Apps/version.json (field was absent).

Test plan

• Verify Nerdbank.GitVersioning resolves the expected version height on main builds.
• Verify Core package versions produced by CI reflect the new offset.

[Copilot]

Pull request overview

This PR adjusts Nerdbank.GitVersioning height offsets for Core package versioning, including the Core root version file and the per-project override for Microsoft.Teams.Apps.

Changes:

• Updates core/version.json versionHeightOffset from -1 to -2.
• Adds versionHeightOffset: -2 to the Microsoft.Teams.Apps project-specific version file.

Reviewed changes

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

File	Description
core/version.json	Adjusts the Core package set version height offset.
core/src/Microsoft.Teams.Apps/version.json	Adds the same offset to the Apps per-project version override.

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