feat(CSI-289): add default nfs option for rdirplus

[sergeyberezansky]

TL;DR

Added "rdirplus" to default NFS mount options and simplified NFS mount option conversion.

What changed?

• Added MountOptionNfsRdirPlus constant with value "rdirplus"
• Included "rdirplus" in DefaultNfsMountOptions
• Removed specific case handling for "inode_bits", "verbose", "quiet", and "obs_direct" options in the AsNfs() function

How to test?

1. Verify that NFS mounts now include the "rdirplus" option by default
2. Test NFS mount operations to ensure they work correctly with the new default options
3. Confirm that removing specific case handling for certain options doesn't negatively impact NFS mount functionality

[sergeyberezansky]

• feat(CSI-289): add default nfs option for rdirplus #368 👈
• dev

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"Request reviewers once CI passes" took an action on this PR • (10/14/24)

1 reviewer was added to this PR based on Sergey Berezansky's automation.