Flip the default value of --incompatible_enable_cc_toolchain_resolution

RELNOTES[INC]: Flip incompatible_enable_cc_toolchain_resolution (#7260)

Closes #19441.

PiperOrigin-RevId: 565666766
Change-Id: Ice1eaa45628c2cd4552e6572101693d02c5aea57

Author: comius

src/main/java/com/google/devtools/build/lib/rules/cpp/CppOptions.java

@@ -911,7 +911,7 @@ public Label getMemProfProfileLabel() {
 
   @Option(
       name = "incompatible_enable_cc_toolchain_resolution",
-      defaultValue = "false",
+      defaultValue = "true",
       documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
       effectTags = {OptionEffectTag.LOADING_AND_ANALYSIS},
       metadataTags = {OptionMetadataTag.INCOMPATIBLE_CHANGE},