[Filebeat][Salesforce] Add CODEOWNER for salesforce as obs-infraobs-integrations

[kush-elastic]

What does this PR do?

This PR adds CODEOWNER for the salesforce module.
Current code owner after update for salesforce is obs-infraobs-integrations

Checklist

Author's Checklist

• Add entry to .github/CODEOWNERS

How to test this PR locally

Related issues/PR

• [O11y][Salesforce] Add support of the interval parameter in Salesforce setupaudittrail-rest fileset. #35938

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @kush-elastic? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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• Start Time: 2023-07-26T05:46:12.157+0000

• Duration: 13 min 35 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3
Skipped	0
Total	3

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[lalit-satapathy]

LGTM