fix: use semantic versioning for version comparisons in check-images-internal.ts

[Copilot]

String-based version comparison is unreliable for semantic versions. For example, "v8.5.10" <= "v8.5.3" incorrectly returns true because "1" < "3" lexicographically.

Changes

• Import @std/semver (already used elsewhere in this repo)
• Add normalizeVersion() to strip v prefix and -enterprise suffix
• Add versionGreaterOrEqual() and versionLessThanOrEqual() helper functions
• Replace all three string comparisons with semver-based comparisons

Example

// Before (buggy)
if (version <= "v8.5.3" && gitRepo === "pingcap/ticdc") { ... }

// After (correct)
if (versionLessThanOrEqual(version, "v8.5.3") && gitRepo === "pingcap/ticdc") { ... }

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