[Insights] [Release 9] Add a Spend Over Time saved search

[puneetlath]

Part of the Insights project

Doc section: https://docs.google.com/document/d/1L2gAchD5IrI545p_iVAMdh6DSnJJcusG90oO-5MH3x0/edit?tab=t.0#heading=h.ckd2zio21z1v

Feature Description

Add a Spend Over Time saved search to all Admin/Auditor/Approver accounts

• Add SPEND_OVER_TIME search key - src/CONST/index.ts - Add SPEND_OVER_TIME: 'spendOverTime' to CONST.SEARCH.SEARCH_KEYS
• Add translation - src/languages/en.ts (and all language files) - Add spendOverTime: 'Spend over time' translation
• Add search definition - src/libs/SearchUIUtils.ts - Add SPEND_OVER_TIME definition in getSuggestedSearches() with query: type:expense group-by:month date:year-to-date sort-by:month sort-order:desc view:line
• Add visibility logic - src/libs/SearchUIUtils.ts - Add visibility logic in getSuggestedSearchesVisibility() to show for Admin/Auditor/Approver roles (same as Top Spenders)
• Add to menu sections - src/libs/SearchUIUtils.ts - Add to Insights menu section in createTypeMenuSections()

Manual Test Steps

Automated Tests

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