[container images] Specify enabling Resource Collection for AWS ECR crawler

[robertjli]

What does this PR do? What is the motivation?

Update Container Images setup documentation for AWS integration to specify that customers need to enable Resource Collection in order for the resources to be crawled.

Merge instructions

Merge readiness:

• Ready for merge

Merge queue is enabled in this repo. To have it automatically merged after it receives the required reviews, create the PR (from a branch that follows the <yourname>/description naming convention) and then add the following PR comment:

/merge

Additional notes

[robertjli]

/merge

[dd-devflow]

View all feedbacks in Devflow UI.
2025-03-05 21:32:16 UTC ℹ️ Start processing command /merge

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2025-03-05 21:32:23 UTC ℹ️ MergeQueue: waiting for PR to be ready

This merge request is not mergeable yet, because of pending checks/missing approvals. It will be added to the queue as soon as checks pass and/or get approvals.
Note: if you pushed new commits since the last approval, you may need additional approval.
You can remove it from the waiting list with /remove command.

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2025-03-06 01:33:05 UTC ⚠️ MergeQueue: This merge request was unqueued

devflow unqueued this merge request: It did not become mergeable within the expected time

[git-thuerk-done]

looks good, please add a comment with /merge when this is ready to be merged!