fix: click-to-filter converts a Contains dimension filter to Select instead of being a no-op

[nishantmonu51]

With a Contains (LIKE) filter applied on a dimension, clicking a value in an explore chart, dimension table, leaderboard, time dimension table, canvas leaderboard or pivot, or the global search did nothing. This is a regression from 0.89, introduced with the unified expression filter component in #9746.

• toggleValue and appendSelectedValues on DimensionFilterManager only mutated selectedValues, but commit() rebuilds the expression from inputText while in Contains mode, so the click was dropped and no notification fired.
• They now switch the manager to Select and clear the search text first. The clicked values become the selection, exclude is preserved (NLIKE becomes NIN), and the existing "Converted filter type to Select" toast fires through the unchanged commit() logic.
• removeSelectedValues is left alone: Contains mode holds no selected values, so converting there would clear the filter with nothing to replace it. In List mode also keeps its mode on click, since a click already works correctly there.
• Adds ExpressionFilterManager.spec.ts cases for toggle, append and remove from Contains mode, including the notification.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!