Cherry-pick #24861 to 7.x: [Filebeat] Fix hardcoded amazonaws.com endpoint

[kaiyan-sheng]

Cherry-pick of PR #24861 to 7.x branch. Original message:

What does this PR do?

Updates the S3 input validation for the queue url to check for the amazonaws.com domain or for the domain to match the endpoint config parameter that already exists.

Why is it important?

Adds the ability for to use non amazonaws.com domains for Filebeat S3 input.

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.

Author's Checklist

How to test this PR locally

Related issues

closes #24420

Use cases

Screenshots

Logs

[elasticmachine]

Pinging @elastic/integrations (Team: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

• Build Cause: Pull request #25009 opened

• Start Time: 2021-04-09T14:47:40.610+0000

• Duration: 71 min 44 sec

• Commit: 4ab9a2a

Test stats 🧪

Test	Results
Failed	0
Passed	6883
Skipped	1185
Total	8068

Trends 🧪

💚 Flaky test report

Tests succeeded.

Expand to view the summary

Test stats 🧪

Test	Results
Failed	0
Passed	6883
Skipped	1185
Total	8068