[UI Feature]: Add support for Workflow Versions

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Motivation:
Flyte allows users to create and use different workflow versions however the current UX does not do a good job of surfacing this functionality.

Goal:
Implement new views that present users a list of workflow versions as well as metadata about that version. In the new flow, after selecting a workflow users will now see that workflow's versions (in addition to the current experience listing that workflows execution history). By selecting a workflow version from the list, users will be taken to a new workflow detail page with various metadata as well as a (static) graph representing that version's form.

We will approach this work in 3 milestones.

Milestone 1: User can see a list of workflow versions
Milestone 2: User can click on workflow versions and be taken to a detail page.
Milestone 3: User can see a version's most recent execution time as well as execution status for last 10 runs.

https://github.com/flyteorg/flyte/projects/20

Comps
These comps (attached) represent a refresh to the Flyteconsole look-and-feel however we've scoped this work to focus only on providing the fucntionality described (ie, commit code will look different as it will maintain current styling) but don't worry the site-refresh work is coming and will be picked up soon so stay tuned!