[ML] Explain log rate spikes: MVP 8.5 improvements.

[walterra]

Follow up to #136265.

API

• Extend analysis API to support results grouping. (WR)
  [ML] Explain Log Rate Spikes: Group results API. #140683

UI

• Align histogram chart layout with Discover
  [ML] Explain Log Rate Spikes: Histogram fixes. #139933
• Clicking a pinned analytics results table should unpin the row selection, it stays pinned atm.
  [ML] Explain Log Rate Spikes: Fix analysis table row pinning. #141455
• Group results (MA)
  [ML] Explain Log Rate Spikes: Add option to view grouped analysis results. #140464
• Link to discover from analysis results table rows (MA)
  [ML] Explain Log Rate Spikes: Adds discover link to analysis table #139877
• Support table hovering with main chart sync on group level
• Improve error handling
  [ML] Explain Log Rate Spikes: Fix error handling. #142047

Bugs

• [ML] Explain Log Rate Spikes: Progress bar stuck at 0% then jumps to 80% #138972
• [ML] Explain Log Rate Spikes: Brush styles not being applied on first render. #139021

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[darnautov]

When the Deviation brush is small enough, the error Error: <rect> attribute width: A negative value is not valid. is thrown when placing it all the way to the right. The brush bounds also break