Convert BuildIgnoreApexContritbutions variable to a boolean

The ignore list is burdensome to maintain once we start adding the
module sdk contents to apex_contributions. Convert the variable to a
boolean. When set to true, all contents in `apex_contributions` will be
ignored

Bug: 308187268
Test: m nothing on aosp,google and google_fullmte devices
Ignore-AOSP-first: CL topic does a cleanup of an internal only denylist

Change-Id: Ibdd1e0d0d4f08f4f5251b9c4baa1aaf42e7df34f
diff --git a/android/variable.go b/android/variable.go
index 4cb11da..6553f1a 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -496,7 +496,7 @@
 
 	BuildFromSourceStub *bool `json:",omitempty"`
 
-	BuildIgnoreApexContributionContents []string `json:",omitempty"`
+	BuildIgnoreApexContributionContents *bool `json:",omitempty"`
 
 	HiddenapiExportableStubs *bool `json:",omitempty"`