fix: avoid accumulating overlay entries across rebuilds

[OskarEichler]

Fix

Stop accumulating duplicate error-overlay entries across rebuilds when using socket integrations such as webpack-hot-middleware.

socketEntryData currently lives for the entire compiler lifetime and is appended to on every make. Three real sequential compilations produce one, two, and three overlay dependencies respectively. Stale entry names are also retained when a dynamic entry function changes its output.

Implementation

Discover integration positions inside the existing finishMake callback, using only the current compilation. This removes the separate make hook and persistent mutable array. Overlay placement remains immediately after the integration entry, and the global-entry fallback is preserved.

Verification

• Existing unit/loader suite: 106 tests across 13 suites, 26 snapshots passed.
• ESLint, formatting, declaration compilation, and whitespace checks passed.
• Twenty real sequential Webpack compilations keep exactly one correctly ordered overlay entry each.
• Real dynamic-entry compilations handle renaming entries and removing the integration, including the global-overlay fallback.
• Full suite including headless Chrome HMR conformance with Webpack Dev Server 6: 122 tests across 14 suites, 26 snapshots passed. This uses the existing upstream harness; no new or modified test files are included.

Compatibility / breaking changes

No public API, dependency, runtime, or supported-platform changes. This fixes compilation bookkeeping and removes work that increased with each rebuild; no application rendering-performance claim.

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