Add unit tests for remove_inputs in InputObserver #2739

Job	Run time
to-2.10-tr-4.48.3-ci ubuntu-latest-3.11	6m 28s
to-2.10-tr-4.51.3-ci ubuntu-latest-3.12	8m 3s
to-2.10-tr-4.51.3-ci ubuntu-latest-3.11	7m 16s
to-2.10-tr-4.51.3-ci ubuntu-latest-3.10	8m 0s
to-main-tr-5.2.0-ci ubuntu-latest-3.12	10m 43s
to-main-tr-main-ci ubuntu-latest-3.13	2m 40s
to-2.10-tr-4.55.4-ci ubuntu-latest-3.12	11m 15s
to-main-tr-4.57.6-ci ubuntu-latest-3.12	10m 48s
to-2.10-tr-4.57.6-ci ubuntu-latest-3.12	11m 50s
to-main-tr-main-ci ubuntu-latest-3.12	2m 44s
to-main-tr-4.48.3-ci ubuntu-latest-3.12	5m 33s
to-main-tr-5.2.0-ci ubuntu-latest-3.13	10m 40s
to-2.10-tr-4.48.3-ci ubuntu-latest-3.10	7m 7s
to-2.10-tr-main-ci ubuntu-latest-3.12	3m 57s
to-main-tr-4.51.3-ci ubuntu-latest-3.12	6m 21s
to-2.10-tr-4.48.3-ci ubuntu-latest-3.12	6m 52s
to-2.10-tr-5.2.0-ci ubuntu-latest-3.12	12m 50s
to-main-tr-4.55.4-ci ubuntu-latest-3.12	9m 58s
	2h 23m 5s

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