feat(pgpm): add --workspace flag to upgrade-modules command

[pyramation]

feat(pgpm): add --workspace flag to upgrade-modules command

Summary

Adds a --workspace flag to pgpm upgrade-modules that allows upgrading all modules across the entire workspace, even when not inside a specific PGPM module directory.

When --workspace is provided:

• Finds all modules in the workspace using getModules()
• Iterates through each module and performs the upgrade operation
• Shows progress with module name prefixes (e.g., [my-module] Found 3 installed module(s)...)

The error message when not in a module now suggests using --workspace as an alternative.

Usage:

pgpm upgrade-modules --workspace --all   # Upgrade all modules across the entire workspace
pgpm upgrade-modules --workspace --dry-run  # Preview upgrades across workspace

Review & Testing Checklist for Human

• Verify --workspace flag works from workspace root directory
• Test combination of --workspace with --all, --dry-run, and --modules flags
• Confirm interactive mode prompts correctly for each module in workspace mode
• No new tests were added - consider if test coverage is needed for the workspace flag

Notes

• Requested by: Dan Lynch (@pyramation)
• Session: https://app.devin.ai/sessions/c0160527834c40d8a7a95616ab904006

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