[ML] Improve job management for users with many jobs

[jgowdyelastic]

Meta issue listing the features needed to remake the Job management page using react and eui

• New job button
• Convert main jobs table
  • Add row sorting
  • Give column headers more width when clicked for sorting
  • refresh jobs using kibana's auto-refresh feature
  • Add better col resizing for very small browser widths
• Convert expanded rows
  • Job settings
    • Including calendars
  • Job config
  • Datafeed
  • Counts
  • JSON
  • Job messages
  • Datafeed preview
  • Forecasts
• Results links on rows
• Action menu on rows
  • Start datafeed
    • Start datafeed modal
  • Stop datafeed
  • Edit job flyout
    • Job details
      • Categorization filters
    • Detectors
    • Datafeed
    • Custom URLS
    • Validate job before saving
    • Display inline validation failures
  • Disable single row actions when multiple jobs are selected
  • Add close job
• Multi-select actions
  • Results links
  • Action menu
  • Start datafeeds
    • Multi-job start modal
  • Stop datafeeds
  • Delete jobs
    • Multi-job delete modal
  • Applying / removing groups
  • Add close jobs
• Job message icons in table
• Group labels in table
• Live jobs status and count updates in table and expanded rows
• Remembering table state, page selection and rows per page
• Job searching and filtering
• Endpoints for supplying summary data for the table
• Endpoints for supplying full jobs. Combining jobs, stats, datafeeds and calendars
• Endpoint tests
• UI tests
• Remove old job management page
• Replace results icons with new icons. (which need to be designed)
• Add better error reporting for endpoint failures. probably use notify
• Start datafeed endpoint should find the correct datafeed for the supplied job, rather than hardcoding the name datafeed-
• Add the general job status bar to the top of the page
• Add permission checks to buttons
• Add no nodes available warning
• Add create watch modal when starting datafeed

[elasticmachine]

Pinging @elastic/ml-ui

[sophiec20]

The end-user driver for doing this work was to improve the usability of the job list for users with many jobs (say between 50-250). Broadly speaking, this is a combination of:

• significantly improved filtering
• improved sorting
• sticky page size
• multi-select actions for jobs (start, stop, delete, view explorer)
• make it easier to add jobs to groups and to see which group a job belongs to
• better control of page refresh

(Migrating to react is an important component of this, however renaming issue to reflect end-user benefit.)

[jgowdyelastic]

Closing issue, left over enhancements have been added to #21196