Add max length validation to saved view title (fixes #589113)

Doby Baxterrequested to merge
gitlab-community/gitlab-org/gitlab:add-maxlength-saved-view-title into master

Closes #589113 (closed)

This MR adds a 40-character max length validation to the Saved View title input in the “New view” modal.

The change mirrors the existing description field validation and prevents backend validation errors during view creation, improving the overall UX.

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