Remove unused event `IndexedTransaction` #438

Job	Run time
sync	50s
build (ubuntu-latest, 1.63.0)	3m 47s
build (ubuntu-latest, stable)	1m 53s
build (ubuntu-latest, beta)	1m 53s
build (ubuntu-latest, nightly)	1m 50s
build (macos-latest, 1.63.0)	2m 45s
build (macos-latest, stable)	1m 22s
build (macos-latest, beta)	1m 24s
build (macos-latest, nightly)	1m 23s
build (windows-latest, 1.63.0)	5m 19s
build (windows-latest, stable)	3m 47s
build (windows-latest, beta)	3m 15s
build (windows-latest, nightly)	3m 4s
	32m 32s

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