refactor: unify branch validation imports across provider components

- Added the `VALID_BRANCH_REGEX` import to all Git provider components to ensure consistent branch validation.
- Removed duplicate imports of `VALID_BRANCH_REGEX` to streamline the code and improve readability.

This change enhances maintainability by centralizing branch validation logic across the application.

packages/server/src/db/schema/user.ts

@@ -1,4 +1,3 @@
-import { paths } from "@dokploy/server/constants";
 import { relations, sql } from "drizzle-orm";
 import {
 	boolean,