feat: ability to start changelog build with different levels of api-processor version validation

[makeev-pavel]

Summary

• Added apiProcessorVersionValidationLevel option to BuilderRunOptions to support relaxed version validation during data migration
• In major mode, changelog builds are allowed when the major version matches, even if minor/patch differs — this unblocks users from publishing while migration is in progress
• When versions participating in a comparison were built by a different api-processor, their builder versions are recorded in previousVersionBuilderVersion / currentVersionBuilderVersion fields of the build result, so the backend can identify and rebuild them after migration completes

Changes

Types

• src/types/internal/builder.ts: Added VersionValidationLevel type ('major' | 'strict') and apiProcessorVersionValidationLevel to BuilderRunOptions
• src/types/internal/compare.ts: Added apiProcessorVersionValidationLevel to CompareContext, new BuilderVersionInfo and CompareResult types
• src/types/external/config.ts, src/types/package/config.ts: Added previousVersionBuilderVersion and currentVersionBuilderVersion fields to BuildConfig and PackageConfig

Validation logic (src/validators.ts)

• validateApiProcessorVersion: Added validationLevel parameter (default strict). In major mode: compares only major version part, skips validation if either version is unparseable
• getMismatchedBuilderVersion: New helper — returns the builder version from resolved version data only if it differs from the current api-processor version
• applyBuilderVersionInfo: New helper — copies previousVersionBuilderVersion / currentVersionBuilderVersion from comparison result to build config (for persistence in info.json)

Comparison pipeline

• src/components/compare/compare.operations.ts: compareVersionsOperations now returns BuilderVersionInfo alongside the comparison. Passes validationLevel from context to validateApiProcessorVersion. Uses getMismatchedBuilderVersion to detect version mismatches
• src/components/compare/compare.ts: compareVersions returns CompareResult (comparisons + builder version info). Builder version info from ref-packages is discarded (only relevant at root level)

Strategy integration

• src/builder.ts, src/strategies/build.strategy.ts, src/strategies/changelog.strategy.ts, src/strategies/prefix-groups-changelog.strategy.ts: All call sites updated to destructure CompareResult and apply builder version info to config via applyBuilderVersionInfo

Test infrastructure

• test/helpers/registry/local.ts: Added VersionOverrideRegistry — extends LocalRegistry to override apiProcessorVersion per version in versionResolver
• test/helpers/utils.ts: Added buildChangelogWithVersionOverrides helper for e2e tests with configurable validation level and spec content

Tests (test/validators.test.ts)

• 28 unit tests for validateApiProcessorVersion: parametrized matrix covering strict/major modes, exact matches, minor/patch/major mismatches, prerelease suffixes, unparseable versions, null versions, error prefix formatting
• 6 e2e tests through PackageVersionBuilder: strict pass/fail, major pass/fail for both previous and current version sides
• 4 integration tests for builder version info: verifies previousVersionBuilderVersion and currentVersionBuilderVersion are set/unset correctly in changelog build results