[chore][receiver/awscontainerinsight] Enable goleak checks in internal packages

[crobert-1]

Description:

This PR contains a few changes:

1. Plumb through context when initializing objects that have long running background operations. This is to ensure the receiver's proper context is used for shutting down. context.Background shouldn't be referenced except for tests here, as it opens the door to possible leaks. This was done for ECSInfo and HostInfo.
2. Add contexts with cancels to tests. This is valid use case for cancelling contexts in test because in practice, the plumbed through context is cancelled by the receiver's shutdown method. These unit tests are operating at a lower level than the receiver, so it's just doing the same thing the receiver shutdown would do.
3. Fix defer calls to shutdown to be inside anonymous func to ensure they're not called until the defer is actually executed.
4. Enable goleak checks on the remaining internal packages of the AWS Container Insights receiver to help ensure no goroutines are being leaked.

Link to tracking Issue:
#30438

Testing:
All existing tests are passing, as well as added goleak checks

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[atoulme]

@pxaws @Aneurysm9 would you please take a look?

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.