fix(snippets): require ces module in internal/generated/snippets/go.mod

[Sebastianhayashi]

Fixes #14005.

Root cause

internal/generated/snippets/go.mod already had:

• replace cloud.google.com/go/ces => ../../../ces

but no matching require entry. As a result, CES snippet packages fail to resolve with:

module cloud.google.com/go/ces provides package ... and is replaced but not required.

Fix

Add a single line in internal/generated/snippets/go.mod:

• cloud.google.com/go/ces v0.1.0

No other files or dependency versions are changed.

Verification

Target command used in evidence:

• cd internal/generated/snippets && go test ./ces/...

Observed in evidence logs:

• before: exit code 1 (setup failed across CES snippet packages)
• after: exit code 0 ([no test files], build succeeds)

Local note: this environment does not have go installed (go: command not found), so I could not re-run Go tests in this shell after cherry-picking the same one-line fix.

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[gemini-code-assist]

Code Review

This pull request adds a require directive for cloud.google.com/go/ces to internal/generated/snippets/go.mod. This resolves a build error caused by having a replace directive for this module without a corresponding require entry. The change is a single-line addition and appears correct.