Task and run page improvements

[matt-aitken]

Runs list

• Query optimizations
• Added column indexes
• Load the page first and defer the data
• Using the read replica

Tasks list

• Removed the last run column (was very slow)
• Added a search box
• Fix for the graph tooltip getting clipped on the last task

Schedules list

• Next run and last run are now UTC

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Latest commit: b1a86de

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