Split CGO unit tests into 5 shards

[Copilot]

The CGO workflow ran unit tests across 4 matrix shards. This splits them into 5 to lower per-shard wall-clock time.

Changes

• .github/workflows/cgo.yml: replaced the D-L and M-R shards with D-G, H-M, and N-R. The A-C and S-Z and other shards are unchanged, so the patterns still partition the full test-name space with no overlap or gaps.

- name: A-C
  pattern: ^Test[A-C]
  shard: a-c
- name: D-G
  pattern: ^Test[D-G]
  shard: d-g
- name: H-M
  pattern: ^Test[H-M]
  shard: h-m
- name: N-R
  pattern: ^Test[N-R]
  shard: n-r
- name: S-Z and other
  pattern: ^Test([S-Z]|[^A-R])
  shard: s-z

No other edits were needed: coverage/result artifacts are named from matrix.shard, and the aggregation job downloads them via the test-result-cgo-unit-* glob.

Note: branch protection required-status-check names derived from Unit tests (<name>) will change and may need updating.

[Copilot]

Pull request overview

Splits CGO unit tests into five balanced shards to reduce per-shard execution time while preserving complete test-name coverage.

Changes:

• Replaces two broad shards with three narrower shards.
• Retains existing artifact aggregation behavior.

Show a summary per file

File	Description
.github/workflows/cgo.yml	Updates the CGO unit-test matrix from four to five non-overlapping shards.

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[github-actions]

🎉 This pull request is included in a new release.

Release: v0.87.5