feat: add internal has-input-value-changed event (CP: 14)

[mukherjeesudebi]

Description

Backports the following PRs:

• feat: add internal has-input-value-changed event web-components#4276
• fix: sync the hasInputValue state on input web-components#4335
• fix: check for bad input when updating _hasInputValue web-components#5092

Part of vaadin/web-components#5763

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