[microsoft_exchange_server] Add ignore_older setting support

[Bearloggs]

This change introduces support for an ignore_older configuration option in advance options to integration microsoft_exchange_server.

• WHAT: Adds the ignore_older setting to allow users to exclude files older than a defined duration from ingestion.
• WHY: This improves performance and relevance by enabling users to skip outdated data, especially in environments where logs accumulate over time but only recent entries are of interest.

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.

[elasticmachine]

Pinging @elastic/sec-windows-platform (Team:Security-Windows Platform)