feat(log-collector): log ec2 regional endpoint reachability

[mselim00]

Issue #, if available:

Description of changes:

Reachability to the EC2 regional endpoint is essential for various core tasks that run on the instance, e.g. for IPAMD to manage ENIs or for nodeadm/bootstrap.sh to find out the instance's private DNS name. This adds a check to confirm that the endpoint can be reached at log collection time, which helps give some insight on whether an earlier error encountered reaching the EC2 endpoint was intermittent/one-off or sustained.

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Testing Done I copied the changed script and ran it on one of my nodes to confirm it creates the regional ping file.

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