[FeedElasticSearch] Fix ids in last run

[ilaner]

In the previous version, we intorduced fetching indicators from elastic search in batches. We save in the last run the last indicator timestamp and the ids which were fetched in the previous version, to handle duplicates.

There is an issue where the ids list is based on the datetime object and not the timestamp, which causes this list to be inaccurate.

related: https://jira-dc.paloaltonetworks.com/browse/XSUP-33218

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
Packs/FeedElasticsearch/Integrations/FeedElasticsearch
FeedElasticsearch.py	303	177	41%	36–38, 77, 81, 84–86, 88–89, 99–102, 120–128, 130–146, 148–153, 155–156, 158, 163, 165–166, 168, 173–177, 180–186, 191–195, 200–209, 219–220, 230, 238–244, 246–248, 250–251, 253–255, 257–266, 268–270, 275–276, 278–280, 282–285, 291–298, 301, 304–305, 319–320, 323–329, 331–334, 337, 399–418, 420–423, 425–426, 428–433
TOTAL	303	177	41%

Tests	Skipped	Failures	Errors	Time
12	0 💤	0 ❌	0 🔥	2.302s ⏱️

[yuvalbenshalom]

see my comment

[content-bot]

This PR was automatically updated by a GitHub Action

• FeedElasticsearch pack version was bumped to 1.1.5.

To stop automatic version bumps, add the ignore-auto-bump-version label to the github PR.