fix: rectify SkipHooks not working with NewDB set in Session method

[aayushacharya]

• Do only one thing
• Non breaking API changes
• Tested

What did this pull request do?

When the Session method is invoked with &gorm.Session{NewDB: true, SkipHooks: true} object, it ignores the SkipHooks. This PR adds the SkipHooks in getInstance method.

User Case Description

// This will still call the associated hook currently. With this PR, hooks associated will not be called in this case.
db.Session(&gorm.Session{NewDB: true, SkipHooks: true}).First(&sampleObj)