Remove emoji test from LineHeightScriptsTest

Emoji glyphs use system fallback fonts (e.g. NotoColorEmoji) whose font-table bounding box metrics do not accurately represent rendered pixel ink when paired with primary fonts. Testing emoji lines via hasNoClipping() causes false-positive test failures on Android devices with updated emoji fonts.

Test: ./gradlew :compose:ui:ui-text:connectedAndroidTest -Pandroid.testInstrumentationRunnerArguments.class=androidx.compose.ui.text.LineHeightScriptsTest
Bug: 553672941
TAG=agy
CONV=3f51fb52-cad8-4e81-937c-b62c19f9801c

Change-Id: I91b640c0ff54eed44b81968008c140b78dce7e72