LDEV-6157 fix jakarta/javax compat for Lucee 6

[zspitzer]

Summary

• Fix NoSuchMethodError: jakarta.servlet.http.HttpServletRequest lucee.runtime.PageContext.getHttpServletRequest() on Lucee 6
• touchDestination() in both javax/jakarta Image.java called pageContext.getHttpServletRequest() directly, binding to jakarta return type at compile time since lucee.jar is a Lucee 7 loader
• Use eng.getClassUtil().callMethod() reflection to avoid bytecode binding (same pattern as extension-websocket 6962d056b7)
• Update CI: build once then test matrix against Lucee 6.2 + 7.0 (stable + snapshot), Java 11 + 21
• Gate deploy to master only
• Add regression test for <cfimage action="writeToBrowser">

Test plan

• Local test against Lucee 6 snapshot — LDEV6157 test passes
• CI green on all 8 matrix combinations (6.2/7.0 × stable/snapshot × Java 11/21)

See: LDEV-6157