fix: use file depending on build configuration to invalidate cache

[ldez]

Adds IgnoredFiles to compute cache.

The name is confusing because this is Go files ignored during the build (build tags), and not related to ignore directive or non-Go files.

// IgnoredFiles lists source files that are not part of the package
// using the current build configuration but that might be part of
// the package using other build configurations.
IgnoredFiles []string

Fixes #6178