ATLAS-5385: Rename header authentication config to atlas.authentication.method.header.* (2.6)

[ramackri]

Summary

Same change as #735, targeted at atlas-2.6 branch.

Rename header authentication properties from atlas.authn.header.* to atlas.authentication.method.header.* in the existing AtlasHeaderPreAuthFilter. No behavior change; same filter logic.

Migration

# Before
atlas.authn.header.enabled=true
atlas.authn.header.username=<header-name>
atlas.authn.header.roles=<header-name>
atlas.authn.header.requestid=<header-name>

# After
atlas.authentication.method.header.enabled=true
atlas.authentication.method.header.username=<header-name>
atlas.authentication.method.header.roles=<header-name>
atlas.authentication.method.header.request-id=<header-name>

Test plan

• Enable header auth with updated property keys in atlas-application.properties
• Verify API access with curl using configured identity headers
• Run AtlasHeaderPreAuthFilterTest

https://issues.apache.org/jira/browse/ATLAS-5385

Related: #735

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