[Custom Logs] Implement input parameter ignore_older

[EmiBruno]

• Enhancement

What does this PR do?

Expose ignore_older option for the Custom Logs integration.

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.

How to test this PR locally

1. Build package and startup test environment:

cd package/log
elastic-package build
elastic-package stack up -v -d --services package-registry

2. Add a new "Custom Logs" integration to a policy
3. Verify if the correct logs are collected by the datastream

Related issues

• Closes [Custom Logs] Implement input parameter ignore_older #7614

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Build stats

• Start Time: 2023-09-14T12:52:21.994+0000

• Duration: 14 min 6 sec

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Package log - 2.2.0 containing this change is available at https://epr.elastic.co/search?package=log