[FIX] grid_overlay: clicking interactive icons should not trigger cell click

[rmbh-odoo]

Description:

Current behavior before PR:

• Clicking the data validation icon incorrectly triggered the grid onCellClicked handler.
• After the recent change allowing zone deselection on mouseup,
  This unintended click caused a recomputation of the selection and closed
  the data validation autocomplete popover.

Desired behavior after PR is merged:

• Clicking the icon no longer triggers the grid’s onCellClicked handler.
• This prevents the unnecessary selection recomputation and keeps the
  autocomplete popover open during icon interaction.

Task: 5392156

review checklist

• feature is organized in plugin, or UI components
• support of duplicate sheet (deep copy)
• in model/core: ranges are Range object, and can be adapted (adaptRanges)
• in model/UI: ranges are strings (to show the user)
• undo-able commands (uses this.history.update)
• multiuser-able commands (has inverse commands and transformations where needed)
• new/updated/removed commands are documented
• exportable in excel
• translations (_t("qmsdf %s", abc))
• unit tested
• clean commented code
• track breaking changes
• doc is rebuild (npm run doc)
• status is correct in Odoo

[robodoo]