Add a timeline to the task page

[droyad]

PRs:

• https://github.com/OctopusDeploy/Diagnostics/pull/1
• https://github.com/OctopusDeploy/OctopusShared/pull/16
• https://github.com/OctopusDeploy/OctopusTentacle/pull/63
• https://github.com/OctopusDeploy/OctopusDeploy/pull/1788

[droyad]

Got something pretty rough looking going (see PRs)

Unfortunately it doesn't auto-scale and resets on every refresh, so it's a bit useless if the deployment is ongoing/ I'm going to leave it there for now, not convinced it's shippable just from a polish point of view. It'd probably take making our own component/SVG thing to make it really sing.

It also adds 2mb of JS

[droyad]

Also, some new log UI:

[johnsimons]

@droyad had a look at this, it does look quite nice. What are the next steps ?