[Filebeat] Fixes for Snyk API changes

[P1llus]

What does this PR do?

This adds fixes for certain API changes for the Snyk module, moving to another way of paginating, and some of the filters have been adjusted.

Why is it important?

Required for the module to continue working with the new API changes.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Related issues

• Closes Filebeat's Snyk module only supports retrieval of 10 items #27292
• Closes Filebeat's Snyk module is not retrieving the audit dataset throwing an error #27293

Tests has been done against our own Snyk account to confirm changes is working as intended

[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: 2021-08-13T08:47:26.949+0000

• Duration: 103 min 16 sec

• Commit: 716dbfb

Test stats 🧪

Test	Results
Failed	0
Passed	7890
Skipped	1201
Total	9091

Trends 🧪

💚 Flaky test report

Tests succeeded.

Expand to view the summary

Test stats 🧪

Test	Results
Failed	0
Passed	7890
Skipped	1201
Total	9091