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Tweaks Certify controller urgencies to 1s for HTML page loads

John Hope requested to merge tweak_certify_html_action_urgencies into master

What does this MR do and why?

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Controller actions that simply load a HTML page should be fast.

However, we notice a common issue of about 300ms being spent in CPU time when rendering Epic, Issue, TestCases, etc #show and #new actions.

In #358016 (closed) we resolved to investigate this for EpicsController#show but have since come to understand it is a much wider issue.

This will require a broader spike with capacity scheduled to look into it. In the mean time this change bumps ~"group:certify" controller action target durations from 0.5s to 1s to clear up some of the noise in error budgets.

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