Retention period for the FS mounts

Background
Retention periods are already in place for the Object Storages.
A similar feature should be implemented for the File Storages.

Approach
While the FS mount is being created/edited, users shall have the ability to set a data retention period. After that period expiration date, there are two possible ways:

1. data will be removed
2. data will be transferred to the "archive" Object Storage

That should look similar to STS/LTS durations settings for Object Storages.

• if STS and LTS durations for the FS mount aren't specified - the data shall be stored as previously
• if STS duration for the FS mount is specified - the data shall be stored in the File Storage during that period, after its expiration:
  • if LTS duration isn't specified - the data shall be removed
  • if LTS duration is specified - the data shall be transferred and stored in the "archive" Object Storage. After the LTS duration expiration, the data shall be removed
• LTS duration for the FS mount couldn't be specified without STS duration
• LTS duration for the FS mount couldn't be less than STS duration

Start by locating the existing Object Storage STS/LTS duration settings, then trace the File Storage mount creation and edit flows. Done means FS mounts support the specified STS and optional LTS behavior, including validation that LTS requires STS and is not shorter, with removal or archive transfer after expiration.