convert HeaderUtilTest to kotlin

[TheMissouri]

Summary:

This PR converts HeaderUtilTest.java to Kotlin as requested in #37708.

Changelog:

[INTERNAL] [CHANGED] - Convert HeaderUtilTest to Kotlin

Test Plan:

Run ./gradlew :packages:react-native:ReactAndroid:test.
All tests should pass.

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[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,747,827	-7
android	hermes	armeabi-v7a	8,060,427	-8
android	hermes	x86	9,239,434	-6
android	hermes	x86_64	9,089,232	-6
android	jsc	arm64-v8a	9,310,421	-8
android	jsc	armeabi-v7a	8,500,358	-5
android	jsc	x86	9,372,919	-7
android	jsc	x86_64	9,626,818	-6

Base commit: 03f70bf
Branch: main

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[cortinico]

LGTM 👍 Thanks for sending this over @TheMissouri

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@cortinico has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cortinico merged this pull request in 1e332b8.