Relocate components from `~/vue_shared/components/form`

What does this MR do and why?

This MR relocates several Vue components from the shared components directory to improve organization and maintainability of the codebase.

Key Changes:

• Moves InputCopyToggleVisibility from ~/vue_shared/components/form to ~/vue_shared/components/input_copy_toggle_visibility/
• Relocates FormErrorsAlert from ~/vue_shared/components/form to ~/organizations/shared/components/
• Moves FormFooterActions from shared components to snippets directory

The changes better align component locations with their primary usage areas and reduce coupling in the shared components directory.

Component	Action	Purpose
InputCopyToggleVisibility	Moved to dedicated directory	Improve component discoverability
FormErrorsAlert	Moved to organizations	Component primarily used by organization features
FormFooterActions	Moved to snippets	Component only used by snippets feature

References

• Related to #497993 (closed) - Initiative to improve component organization

MR acceptance checklist

• Code follows GitLab conventions
• Only file moves - no functional changes
• All imports updated to reflect new paths
• Storybook paths updated

How to set up and validate locally

1. Check out branch locally
2. Run affected Jest tests:

# Test affected EE components
yarn jest ee/spec/frontend/pages/admin/ai/self_hosted_models/self_hosted_model_form_spec.js
yarn jest ee/spec/frontend/saml_sso/components/scim_token_spec.js

# Test affected CE components
yarn jest spec/frontend/vue_shared/components/input_copy_toggle_visibility/
yarn jest spec/frontend/organizations/shared/components/errors_alert_spec.js
yarn jest spec/frontend/snippets/components/form_footer_actions_spec.js

3. Confirm no console errors or broken imports