resolves #2874

Changes:
Added a new mutation ContainerRegistryEditorModalModifyWithoutPasswordMutation to handle registry modifications when the password remains unchanged. This prevents sending unnecessary password data during updates.

Implementation Details:

• Created a separate mutation path for registry modifications without password changes
• Updated the handleSave function to use the appropriate mutation based on whether the password was modified
• Added loading state tracking for the new mutation in the modal's confirm button

Rationale:
This change improves security by not transmitting password data when it hasn't been modified, following the principle of least privilege.

Checklist:

• Mention to the original issue
• Documentation
• Minium required manager version: 24.09
• Specific setting for review: refer issue
• Minimum requirements to check during review
• Test case(s) to demonstrate the difference of before/after

Testing Requirements:

1. Verify registry updates work when password is not modified
2. Confirm password updates still function when modified
3. Check error handling for both mutation paths