feat(projects): add Clone Project feature in General settings

[suda]

Summary

• Adds a Clone Project card between API Keys and Danger Zone in the General settings page
• Implements a single cloneProject repository function that copies project settings, integrations, credentials (re-encrypted with new project ID as AAD), agent configs, and trigger configs in one DB transaction
• Adds a projects.clone tRPC mutation with ownership verification and slug validation
• Creates a CloneProjectDialog component following the same pattern as project-form-dialog.tsx
• Also fixes 8 pre-existing test failures caused by the GitLab integration not being reflected in webhook and credential-scoping tests

Key design decisions:

• The repo field is intentionally NOT copied due to the unique DB constraint — UI copy clarifies the user must configure it post-clone
• Credentials are transparently re-encrypted via reEncryptCredential(value, sourceId, newId) — handles both plaintext and encrypted values with no special casing
• All DB writes are wrapped in a single transaction for atomicity
• ID collision (duplicate newId) surfaces naturally via the DB unique constraint error shown in the dialog

Test plan

• Unit tests for cloneProject repository function — verifies all 5 record groups (project, integrations, credentials, agentConfigs, triggerConfigs), throws on missing source, skips inserts for empty related tables
• Unit tests for projects.clone tRPC mutation — verifies ownership check, correct args passed, slug validation, unauthenticated rejection
• Fixed 8 pre-existing test failures: webhooks.test.ts (6 tests needed gitlabOnly: false) and credential-scoping.test.ts (2 tests needed GITHUB_TOKEN_IMPLEMENTER and GITLAB_TOKEN_IMPLEMENTER env var clearing)
• All 7357 unit tests pass
• TypeScript type checking passes (zero errors)
• Lint passes (zero new warnings)
• Manual: Clone a configured project → verify settings, integrations, masked credentials, agent configs, and triggers appear on the new project page

Card: https://trello.com/c/TC7BZD6a/15-many-projects-might-use-almost-exactly-the-same-configuration-of-scm-pm-integrations-engine-or-agents-please-add-an-option-in-pr

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