gopls: expand multi-value returns in function extraction

[fatanugraha]

When extracting a function, handle return statements containing
multi-value function calls by expanding them into variable
assignments. This ensures valid syntax when the extracted function
adds additional return values.

Fixes golang/go#77240

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Message from Madeline Kalil:

Patch Set 2: Commit-Queue+1

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Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2026-01-20T18:32:36Z","revision":"f50b203a08bfb3bdf811a4e739851fa7d4f4a6c2"}

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Patch Set 2: -Commit-Queue

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Patch Set 2:

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Message from Madeline Kalil:

Patch Set 2:

(3 comments)

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Message from Fata Nugraha:

Patch Set 3:

(3 comments)

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Message from Fata Nugraha:

Patch Set 3:

(1 comment)

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Patch Set 4:

(1 comment)

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