fix(schematics): exclude spec files from build compilation

[Copilot]

• Revert exclude pattern from schematics tsconfig.json
• Add vitest imports (describe, it, expect, beforeEach) to spec file
• Update expect() calls to remove Jasmine-specific error messages
• Verify schematics build passes
• Verify migrations build passes

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[ChronosSF]

@copilot , instead of excluding the tests, add imports for those functions that are not available from vitest

[Copilot]

@copilot , instead of excluding the tests, add imports for those functions that are not available from vitest

Done. Added imports for describe, it, expect, and beforeEach from vitest, reverted the exclude pattern, and updated the expect() calls to remove Jasmine-specific error messages (commit bec9c8a).