[Bug] Fix HE_EQUALS_USE_HASHCODE: add missing hashCode() to Config model classes

[cxhello]

Background

Follow-up to #14469 (SpotBugs check enforcement). This addresses the HE_EQUALS_USE_HASHCODE pattern — classes that define equals() but rely on Object.hashCode(), violating the Java equals/hashCode contract. This can cause incorrect behavior when used in HashMap/HashSet.

Affected locations (3 occurrences under threshold=High)

#	Module	File	Line	Description
1	config	ConfigAdvanceInfo.java	L133-140	equals() based on multiple config metadata fields
2	config	ConfigInfoBase.java	L175-213	equals() based on dataId, group, content, md5
3	config	ConfigInfoChanged.java	L64-88	equals() based on dataId, group

Fix

Add hashCode() implementation using Objects.hash(...) based on the same fields used in equals() for each class.

After fixing, remove the HE_EQUALS_USE_HASHCODE exclusion from style/spotbugs-exclude.xml.