Add file related functions in the exclusion list of alternative functions rule

[ernilambar]

Following functions are added in the exclusion list for alternative functions rule:

• WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
• WordPress.WP.AlternativeFunctions.file_system_operations_file_put_contents

Above function calls are giving almost always false positives. So those should be reviewed manually.

[github-actions]

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Co-authored-by: ernilambar <rabmalin@git.wordpress.org>
Co-authored-by: swissspidy <swissspidy@git.wordpress.org>
Co-authored-by: davidperezgar <davidperez@git.wordpress.org>

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