Partial rollback: Flip incompatible_enable_cc_toolchain_resolution

CC toolchains interact with Android and Apple rules and could cause potential failures. The flag flip has not been sufficiently "incubated" and it's a bad idea to do it immediately before the release.

Rolling it back for the release and potentially rolling it forward again at head after the release.

RELNOTES[INC]: (Rollback) Flip incompatible_enable_cc_toolchain_resolution (#7260)

PiperOrigin-RevId: 476289906
Change-Id: I50e75c069fb797533d32ca35d3dcb4a8f7a2d381

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

@@ -878,7 +878,7 @@ public Label getPropellerOptimizeLabel() {
 
   @Option(
       name = "incompatible_enable_cc_toolchain_resolution",
-      defaultValue = "true",
+      defaultValue = "false",
       documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
       effectTags = {OptionEffectTag.LOADING_AND_ANALYSIS},
       metadataTags = {OptionMetadataTag.INCOMPATIBLE_CHANGE},