Do not promote float32 automatically

[Algunenano]

Changelog category (leave one):

• Improvement

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

• When comparing a Float32 column and a const string, read the string as Float32 (instead of Float64).

Documentation entry for user-facing changes

#58680

[robot-ch-test-poll3]

This is an automated comment for commit 8049d35 with description of existing statuses. It's updated for the latest CI running

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Successful checks

Check name	Description	Status
AST fuzzer	Runs randomly generated queries to catch program errors. The build type is optionally given in parenthesis. If it fails, ask a maintainer for help	✅ success
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Compatibility check	Checks that clickhouse binary runs on distributions with old libc versions. If it fails, ask a maintainer for help	✅ success
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Check name	Description	Status
Performance Comparison	Measure changes in query performance. The performance test report is described in detail here. In square brackets are the optional part/total tests	❌ failure

[alexey-milovidov]

@Algunenano, the changelog entry is not good for an end user.