Honor DOTNET_GLOBAL_INSTALL_DIR in activation scripts

[Copilot]

activate.ps1 and activate.sh now align with startvs.cmd when a global .NET install directory is configured.

Changes

• Use DOTNET_GLOBAL_INSTALL_DIR as DOTNET_ROOT when non-empty.
• Retain the repository-local .dotnet directory as the fallback.

DOTNET_GLOBAL_INSTALL_DIR=/path/to/dotnet
source ./activate.sh
# DOTNET_ROOT=/path/to/dotnet

[Copilot]

🟢 Approval recommended

No unresolved review comments remain.

Pull request overview

Updates activation scripts to honor DOTNET_GLOBAL_INSTALL_DIR while retaining .dotnet as the fallback.

Changes:

• Updated Bash activation logic.
• Updated PowerShell activation logic.

File summaries

File	Description
activate.sh	Selects the global directory or local fallback.
activate.ps1	Selects the global directory or local fallback.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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