feat: New look and feel for event page

[adong]

Context

Modernize event page:

1. Add navigation from old ui to new ui and vice versa to sd admins
2. Move options from top to left side
3. Move events/pull-requests from right side to left side along combining jobs(job-list-view)
4. implemented routing rejection for non-sdadmin users
5. rename routes from new/ to v2/

Pending:

1. Change the event-list view layout from right to left
2. Change the workflow-graph view layout from left to right
3. Tests are not written until logics are finalized.

Objective

Screenshot:

References

screwdriver-cd/screwdriver#3200

License

I confirm that this contribution is made under the terms of the license found in the root directory of this repository's source tree and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[VonnyJap]

tests failed, expected?
can we not use naming of file with newui prefix? prefer something like versioning or theme name.