[Snyk and Cloudflare] Fix indefinite pagination

[P1llus]

What does this PR do?

There was no condition for pagination to end even if a page was empty, this PR adds checks for response body count, and errors out if its empty to end the pagination.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Start Time: 2022-07-05T07:01:41.776+0000

• Duration: 16 min 59 sec

Test stats 🧪

Test	Results
Failed	0
Passed	106
Skipped	0
Total	106

🤖 GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (4/4)	💚
Files	100.0% (5/5)	💚 3.529
Classes	100.0% (5/5)	💚 3.529
Methods	100.0% (57/57)	💚 10.691
Lines	94.332% (882/935)	👍 3.389
Conditionals	100.0% (0/0)	💚