[SERF-498] Fix passing data using context in Gorm

[laynax]

Description

There was an issue in instrumentation package when passing the data within context and the result was that there were no metrics (or basically no metrics in database context) as is seen here for example.
The fix was to use db.Statement.Context instead of db.Set() as it's suggestion in the new version of gorm documentation.
There is also new unit test to cover the issue for future references.

Testing considerations

The work was tested in document-search development and the result trace can be seen here.

Checklist

• Prefixed the PR title with the JIRA ticket code
• Performed simple, atomic commits with good commit messages
• Verified that the commit history is linear and commits are squashed as necessary
• Thoroughly tested the changes in development and/or staging
• Updated the README.md as necessary

Related links

• SERF-498
• [SERF-498] Upgrade gorm to v2 #58

[Neurostep]

LGTM 🚀

[Neurostep]

LGTM 🚀