Change validation of automatic backup retention days of FSx Lustre to 90

[hanwen-cluster]

Description of changes

• This code change aligns with FSx doc https://docs.aws.amazon.com/fsx/latest/APIReference/API_LustreFileSystemConfiguration.html and ParallelCluster doc https://docs.aws.amazon.com/parallelcluster/latest/ug/SharedStorage-v3.html#yaml-SharedStorage-FsxLustreSettings-AutomaticBackupRetentionDays

Tests

• Tests will run after PR is merged

Checklist

• Make sure you are pointing to the right branch.
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• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

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