session_test.rs: Move some tests to integration

[sylwiaszunejko]

Tests that require a running cluster should be in integration tests.

This PR moves some of such tests from session_test.rs. Not all, because two of them use

scylla-rust-driver/scylla/src/statement/prepared_statement.rs

Lines 458 to 465 in 27aeca2

	pub(crate) fn serialize_values(
	&self,
	values: &impl SerializeRow,
	) -> Result<SerializedValues, SerializationError> {
	let ctx = RowSerializationContext::from_prepared(self.get_prepared_metadata());
	SerializedValues::from_serializable(&ctx, values)
	}
	}

that is not publicly available.

Pre-review checklist

• I have split my patch into logically separate commits.
• All commit messages clearly explain what they change and why.
• I added relevant tests for new features and bug fixes.
• All commits compile, pass static checks and pass test.
• PR description sums up the changes and reasons why they should be introduced.
• I have provided docstrings for the public items that I want to introduce.
• I have adjusted the documentation in ./docs/source/.
• I added appropriate Fixes: annotations to PR description.

[github-actions]

cargo semver-checks found no API-breaking changes in this PR! 🎉🥳
Checked commit: d263226