Improve workload search help text to clarify version searching capability

[Copilot]

Summary

Updates the workload search command description in the top-level dotnet workload -h help output to make it clear that users can search for both workloads and workload versions.

Problem

The current help output only mentions searching for workloads:

search <SEARCH_STRING>        Search for available workloads.

However, the dotnet workload search version subcommand provides powerful functionality for searching workload sets and versions, which was not discoverable from the main help. Users had to know about this capability or stumble upon it by running dotnet workload search -h.

Solution

Updated the WorkloadSearchCommandDescription resource string from:

• Before: "Search for available workloads."
• After: "Search for available workloads or workload versions."

This change makes the version searching capability immediately discoverable when users run dotnet workload -h.

Impact

• Improved discoverability: Users can now easily find the workload version search functionality
• Better user experience: No need to dig into subcommand help to discover version search capabilities
• Minimal change: Only the help text was updated, no functional changes to any commands
• Preserved localization: All .xlf files were automatically updated with proper review states

The dotnet workload search version command provides three different search modes:

1. List latest workload versions from the current feature band
2. Show workload manifest versions for a specific workload version
3. Find workload versions matching specific workload@version combinations

These capabilities are now more discoverable thanks to the improved help text.

Fixes #50981

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