[SB][Notif] Don't show text in status bar chip if < 50% of it fits.

See b/364653005#comment51 for screenshots

Bug: 364653005
Flag: com.android.systemui.status_bar_notification_chips

Test: Trigger chip with incredibly long shortCriticalText -> verify no
text shows
Test: Trigger chip with a bit of overflow shortCriticalText -> verify
text shows and fades out
Test: Trigger chip with very short shortCriticalText -> verify text
shows and chip width < max width
Test: atest ChipTextTruncationHelperTest

Change-Id: I2c7db5d7c49bea770ccff3fb8d9f4c2124b5e04b