fix: resolve CI toolchain resolution and test configuration failures

- Fix TinyGo toolchain resolution by making it optional in wit_bindgen rule
- Fix test suite configuration errors by commenting out missing test targets
- Enables builds to proceed when TinyGo toolchain is not available for non-Go targets

Author: avrabe

test/go/BUILD.bazel

@@ -122,9 +122,9 @@ test_suite(
         ":test_debug_component_provides_info",
         ":test_simple_test_component_provides_info",
 
-        # WIT bindgen tests
-        ":test_calculator_bindings_generation",
-        ":test_http_service_bindings_generation",
+        # WIT bindgen tests (commented out until WIT-based examples are added)
+        # ":test_calculator_bindings_generation",
+        # ":test_http_service_bindings_generation",
 
         # Validation tests
         ":test_calculator_component_valid_wasm",

wit/wit_bindgen.bzl

@@ -391,7 +391,7 @@ wit_bindgen = rule(
     toolchains = [
         "@rules_wasm_component//toolchains:wasm_tools_toolchain_type",
         "@rules_wasm_component//toolchains:file_ops_toolchain_type",
-        "@rules_wasm_component//toolchains:tinygo_toolchain_type",
+        config_common.toolchain_type("@rules_wasm_component//toolchains:tinygo_toolchain_type", mandatory = False),
     ],
     doc = """
     Generates language bindings from WIT files.