[Feature] Re-enable the embedlit analyzer after the Go 1.27 upgrade

[zhuangzhewei09]

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• I had searched in the issues and found no similar feature requirement.

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ci

Description

The Go 1.27 upgrade in #5188 temporarily disables the embedlit analyzer under modernize in .golangci.yml to keep the upgrade focused.

This issue tracks the code cleanup and re-enabling the analyzer after #5188 is merged, as requested in the review:
#5188 (comment)

Completion criteria:

• Update the affected Go code and tests to address embedlit diagnostics while preserving existing behavior.
• Remove embedlit and its temporary explanatory comments from modernize.disable, keeping other settings unchanged.
• Pass the existing golangci-lint checks and the affected package tests with Go 1.27.

Use case

Go 1.27 allows struct literals to initialize fields promoted from embedded structs directly. The embedlit analyzer identifies opportunities to simplify these initializations.

Re-enabling the check after the cleanup lets CI enforce this pattern and removes the temporary exception introduced by the upgrade.

Related issues

• [Feature] Upgrade to golang v1.27 #5178 — Go 1.27 upgrade.
• [CI] Upgrade Go version compatibility baseline to 1.27 (#5178) #5188 — Upgrade PR; prerequisite for implementing this follow-up.
• [Feature] Enable newexpr in the golangci-lint #4694 — Similar follow-up for re-enabling newexpr after the Go 1.26 upgrade.

Are you willing to submit a PR?

• Yes I am willing to submit a PR!