feat(es/minifier): Make import deduplication unconditional
Remove merge_duplicate_imports option and make import deduplication run
unconditionally during minification to reduce bundle size.
- Remove merge_duplicate_imports option from CompressOptions
- Update pure optimizer to always merge duplicate imports
- Remove option from Terser compatibility layer
- Update test configuration to reflect unconditional behavior
Fixes #11133
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Co-authored-by: Donny/ź°ėģ¤ <kdy1@users.noreply.github.com>