In Install.md->CloudStack UI Commands(npm)

[Imvedansh]

Description

This PR updates INSTALL.md to include essential setup commands for first-time contributors, ensuring a smoother installation process and reducing setup errors.
Changes:

Added mysql_secure_installation to improve MySQL security.
Included steps for setting up the CloudStack UI (npm install, npm build, npm start).
Clarified the requirement to set CS_URL=http://localhost:8080/client in .env.local for API communication.
Explicitly mentioned that the management server runs at http://localhost:5050/.

These improvements will make onboarding easier and reduce setup issues.
#10590
Types of changes

Breaking change (fix or feature that would cause existing functionality to change)
New feature (non-breaking change which adds functionality)
Bug fix (non-breaking change which fixes an issue)
Enhancement (improves an existing feature and functionality)
Cleanup (Code refactoring and cleanup, that may add test cases)
build/CI

test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity
Feature/Enhancement Scale

Minor

Major

Bug Severity

BLOCKER
Critical
Major
Minor

Trivial

Screenshots :

How Has This Been Tested?

Followed the updated steps on a fresh Ubuntu 22.04.5 environment.
Ensured the UI builds successfully and connects to the management server.
Verified mysql_secure_installation improves security settings.
Confirmed the management server is accessible at http://localhost:5050/.

How did you try to break this feature and the system with this change?

Tested installation without mysql_secure_installation to confirm the security risk.
Omitted CS_URL in .env.local and verified API connection failure.
Attempted to start the UI without installing dependencies to confirm issues.

[boring-cyborg]

Congratulations on your first Pull Request and welcome to the Apache CloudStack community! If you have any issues or are unsure about any anything please check our Contribution Guide (https://github.com/apache/cloudstack/blob/main/CONTRIBUTING.md)
Here are some useful points:

• In case of a new feature add useful documentation (raise doc PR at https://github.com/apache/cloudstack-documentation)
• Be patient and persistent. It might take some time to get a review or get the final approval from the committers.
• Pay attention to the quality of your code, ensure tests are passing and your PR doesn't have conflicts.
• Please follow ASF Code of Conduct for all communication including (but not limited to) comments on Pull Requests, Issues, Mailing list and Slack.
• Be sure to read the CloudStack Coding Conventions.
  Apache CloudStack is a community-driven project and together we are making it better 🚀.
  In case of doubts contact the developers at:
  Mailing List: dev@cloudstack.apache.org (https://cloudstack.apache.org/mailing-lists.html)
  Slack: https://apachecloudstack.slack.com/

[Pearl1594]

LGTM. Should we remove this line though https://github.com/apache/cloudstack/pull/10593/files#diff-09b140a43ebfdd8dbec31ce72cafffd15164d2860fd390692a030bcb932b54a0R92?