Improve Exception/Connectivity handling with Cluster Tab

[lbwexler]

Cluster Tab

• DRY for exception/visibility handling in cluster tab
• Standardize exception handling for log display
• Preserve visual state during cluster restart, instance swap

General

• Improve Error Handling with mode toast to avoid extra click

See related Hoist-Core PR

Hoist P/R Checklist

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• [x] Caught up with develop branch as of last change.
• [x] Added CHANGELOG entry, or determined not required.
• [x] Reviewed for breaking changes, added breaking-change label + CHANGELOG if so.
• [x] Updated doc comments / prop-types, or determined not required.
• [x] Reviewed and tested on Mobile, or determined not required.
• [x] Created Toolbox branch / PR, or determined not required.

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[lbwexler]

@amcclain -- was trying to get Greg's buy-in here, before asking for your review, but think this change represents my best thinking on this.

[ghsolomon]

Just reviewed. This looks great to me - really nice use of LoadSupport.lastLoadException, which I'll have to start using!

[lbwexler]

Reviewed with ATM as well and will merge this shortly, as we all seem to like the overall approach

We discussed future iterations providing even more information in the mask about the state of the last load attempt. Useful for reassuring anxious XH developers.