[Feature-18402][API][UI] Add read-only task search to locate owning workflows

[yykaue]

Purpose of the pull request

Fixes #18402

After DSIP-59 removed standalone task management, operators lost the entry point for locating workflows by task name.

This PR adds a read-only search within the current project, including tasks that have never run or whose execution instances have been purged. It preserves the architecture introduced by DSIP-59 without adding standalone task creation, editing, or execution.

Brief change log

• Add GET /projects/{projectCode}/task-definition/search with task name filtering and pagination.
• Add a Task Search page next to Task Instance, displaying task names, task types, and clickable owning workflows.
• Query task versions referenced by current workflow definitions and deduplicate multiple upstream relations before pagination.
• Enforce existing project read permissions and treat _, %, and ! as literal search characters.
• Add English and Chinese translations and documentation.

Verify this pull request

• All 33 targeted backend tests passed, including 13 new tests covering query results, project isolation, permissions, version matching, deduplication, pagination, and parameter validation.
• Database queries were verified using H2 in MySQL compatibility mode.
• Frontend type checking, production build, ESLint, Prettier, and Java Spotless checks passed.
• Browser checks using a mock API verified search, empty results, pagination, page size changes, project switching, and workflow link targets.

[boring-cyborg]

Thanks for opening this pull request! Please check out our contributing guidelines. (https://github.com/apache/dolphinscheduler/blob/dev/docs/docs/en/contribute/join/pull-request.md)

[SbloodyS]

PleasePlease discuss the implementation in issue, and then PR after reaching a consensus.