Fix pre-push hook to always call git lfs pre-push when DRS config incomplete

[Copilot]

The pre-push hook was returning early when GetRemoteClient failed, which skipped both DRS preparation and git lfs pre-push. This broke LFS file transfers when DRS configuration was incomplete (e.g., "push was called before drs config complete").

Changes

• Extracted DRS preparation to prepareDrsObjects(): Isolated error-prone logic into a function that returns early on failures without blocking the main push flow
• Changed DRS errors from fatal to warnings: All DRS-related failures (GetDefaultRemote, GetRemoteClient, UpdateDrsObjects) now log warnings and continue instead of returning early
• Ensured git lfs pre-push always executes: Main hook flow now unconditionally calls git lfs pre-push after attempting DRS preparation
• Added support for all DRS client types: Removed hard failure on non-IndexDClient types; now handles IndexDClient and AnvilClient appropriately

Behavior

When DRS config is incomplete or operations fail:

Warning. Skipping DRS preparation. Error getting remote client: <error>
# DRS preparation skipped
# git lfs pre-push proceeds normally
# LFS files transfer successfully

Users can now push LFS files regardless of DRS configuration state. DRS issues are surfaced as warnings to stderr and logs, but don't block Git operations.

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