Add supported modes to category

[adamraine]

This change prevents the plugin from operating in "timespan" and "snapshot" modes which can be used to audit a page beyond the initial page load: https://github.com/GoogleChrome/lighthouse/blob/master/docs/user-flows.md. The "navigation" mode is how Lighthouse traditionally works.

Before this change, this plugin would emit errors in timespan mode because the trace does not always include events such as the FCP in timespan mode.

I think it's best to exclude the new modes for now to prevent errors from popping up in DevTools Lighthouse.

[jburger424]

From the presubmit failures, it looks like we'll need to update our version of lighthouse to support this change.

Do you want to make that change in this PR, or would you prefer that I do it in a separate PR first?

[adamraine]

From the presubmit failures, it looks like we'll need to update our version of lighthouse to support this change.

Hmm the PR that added the filter should be included in 8.6.0 GoogleChrome/lighthouse#13161

[jburger424]

From the presubmit failures, it looks like we'll need to update our version of lighthouse to support this change.

Hmm the PR that added the filter should be included in 8.6.0 GoogleChrome/lighthouse#13161

I think a change will need to be made here to support this setting for plugins: https://github.com/GoogleChrome/lighthouse/blob/bfa5351639f81ea8a034bed6fb752864ff71f580/lighthouse-core/config/config-plugin.js#L127

[adamraine]

I think you are right, I'll make the change in Lighthouse