Fix insert-select + insert_deduplication_token bug by setting streams to 1

[jrdi]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix the issue causing undesired deduplication on insert-select queries passing a custom insert_deduplication_token. The change sets streams to 1 in those cases to prevent the issue from happening at the expense of ignoring max_insert_threads > 1

Related to #60746

[robot-ch-test-poll4]

This is an automated comment for commit b4e90e5 with description of existing statuses. It's updated for the latest CI running

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[jrdi]

After adding changes to prevent the issue, I have changed the PR from not for changelog to bug fix.

[nickitat]

Changelog entry doesn't mention what is the "issue" specifically

[jrdi]

• Stateless tests (release, analyzer, s3, DatabaseReplicated) [4/4]: Not related, a read query failing and a test expected to fail that's not failing
• Stateless tests (tsan) [4/5]: 02007_test_any_all_operators failed due to an internal timeout. Shouldn't be related to this PR.