25.3.14 Stable backport of #82900: trim - return a const value for all-const inputs (Bug 78796)

[zvonand]

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):

If function trim called with all-constant inputs now produces a constant output string. (Bug ClickHouse#78796). (ClickHouse#82900 by @rschu1ze)

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Regression jobs to run:

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[Selfeer]

Audit Review: PR #1425 (trim const-result backport)

1. Confirmed defects (High/Medium/Low)

No confirmed defects in reviewed scope.

[Selfeer]

No related failures in CI/CD to analyze