fix(core): combobox communicateByObject bugs

[mikerodonnell89]

fixes #12519

• Fixes a bug where the onChange/valueChange is triggered every keystroke for communicateByObject, when the docs say it should only fire when an item from the dropdown is actually selected
• Fixes a bug where selecting an item that has a matching display name with another item doesn't actually select either of them (vid below)

Before

Screen.Recording.2024-12-05.at.4.13.27.PM.mov

After

Screen.Recording.2024-12-05.at.4.14.33.PM.mov

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