Move comment sort to separate view title button

[Copilot]

Sort and filter are conceptually different operations. Users expected sort controls separate from the filter dropdown, not nested within "More Filters...".

Changes

Moved comment sort from filter submenu to dedicated view title button:

• Relocated commentSortSubmenu from viewFilterSubmenu to MenuId.ViewTitle
• Changed icon from Codicon.history to Codicon.sortPrecedence
• Updated menu group from '2_sort' to 'navigation' (order: 1)

Before: Filter dropdown → More Filters → Sort By
After: Dedicated sort button in view title bar (adjacent to filter)

Filter actions (Show Resolved/Unresolved) remain in viewFilterSubmenu as intended.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Break comment sort into a separate button outside of the filter input</issue_title>
<issue_description>Testing #226657

While filtering is certainly related to sorting, they're different things. I was not expecting sort actions to be there:

I see we have this icon:

But I was expecting one like this:

or

</issue_description>

Comments on the Issue (you are @copilot in this section)

@alexr00 This was inspired by the extensions view. @daviddossett is there a canonical way we do this? @alexr00 Makes sense, thank you for weighing in!

• Fixes Break comment sort into a separate button outside of the filter input #226763

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