Add and fix auth API tests, improve test reliability for strong password validation

[Chitransh1011]

Title

Add and Fix Auth API Tests, Improve Reliability for Strong Password Validation

Description

This PR enhances the test coverage and reliability of the Auth API by:

• Adding new test cases for authRoutes (signup, login, JWT handling).

• Fixing failing/unstable tests related to authentication.

• Improving test reliability for strong password validation to ensure stricter compliance with password rules.

Changes Made

• Added unit/integration tests for authRoutes in templates/mern+tailwind+auth and templates/mean+tailwind+auth

• Updated password validation tests to cover edge cases (weak, medium, strong passwords).

• Fixed inconsistencies in existing tests.

• Improved test assertions for more accurate and reliable results.

How to Test

• In the templates/mean+tailwind+auth/server run this command and In templates/mean+tailwind+auth/javascript/server also to test it.
  Run the test suite:

  npm test  

• Verify all tests pass successfully.

[Chitransh1011]

Hey @Guruprasadh-R I have added the test for AuthRoutes can you review it