[APMLP-849] Refactor remaining `ImageResolver` files into `imageresolver` package #150425

Job	Run time
release-note-check	1m 13s
agenttelemetry-list-change-ack-check	29s
ask-reviews	0s
assign-team-label	31s
fetch-labels	4s
team-label-check	2s
skip-qa-check	24s
	2m 43s

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