refactor: introduce vite as build tool

[soleksy-splunk]

Issue number:

PR Type

What kind of change does this PR introduce?

• Feature
• Bug Fix
• Refactoring (no functional or API changes)
• Documentation Update
• Maintenance (dependency updates, CI, etc.)

Summary

Changes

part of #1657
introducing Vite as a package build tool

User experience

N/A - should stay the same

Checklist

If an item doesn't apply to your changes, leave it unchecked.

Review

• self-review - I have performed a self-review of this change according to the development guidelines
• Changes are documented. The documentation is understandable, examples work (more info)
• PR title and description follows the contributing principles
• meeting - I have scheduled a meeting or recorded a demo to explain these changes (if there is a video, put a link below and in the ticket)

Tests

See the testing doc.

• Unit - tests have been added/modified to cover the changes
• Smoke - tests have been added/modified to cover the changes
• UI - tests have been added/modified to cover the changes
• coverage - I have checked the code coverage of my changes (see more)

Demo/meeting:

Reviewers are encouraged to request meetings or demos if any part of the change is unclear

[soleksy-splunk]

the CI / compliance-copyrights (pull_request) fails due to ui/babel.config.cjs being present instead of ui/babel.config.js (.cjs instead of .js). I'm not adding it for licensing as it is removed in vitest PR

[rohanm-crest]

Everything LGTM, just a minor changes