fix: use valid WASM target triples for rules_rust compatibility

Remove invalid target triples that are not supported by rules_rust
and update to use standard WASM targets.

Changes:
- Remove wasm32-wasip1 and wasm32-wasip2 (not valid rules_rust targets)
- Use wasm32-wasi (WASI Preview 1, supported by rules_rust)
- Keep wasm32-unknown-unknown (standard WASM target)
- Update WASM_TARGET_TRIPLE constant to use valid triple
- Update helper function to use supported targets

This resolves the rules_rust extension error about invalid target
triples and ensures compatibility with the current rules_rust version.

Author: Rules WASM Component

MODULE.bazel

@@ -23,8 +23,6 @@ rust.toolchain(
     extra_target_triples = [
         "wasm32-unknown-unknown",
         "wasm32-wasi",
-        "wasm32-wasip1",
-        "wasm32-wasip2",
     ],
 )
 use_repo(rust, "rust_toolchains")

common/common.bzl

@@ -1,14 +1,13 @@
 """Common constants and utilities"""
 
 # WebAssembly target triples
-WASM_TARGET_TRIPLE = "wasm32-wasip2"
-WASM_TARGET_TRIPLE_P1 = "wasm32-wasip1"
+WASM_TARGET_TRIPLE = "wasm32-wasi"  # WASI Preview 1 (supported by rules_rust)
 WASM_TARGET_TRIPLE_UNKNOWN = "wasm32-unknown-unknown"
 
 # File extensions
 WASM_EXTENSION = ".wasm"
 WIT_EXTENSION = ".wit"
 
-def get_wasm_target(preview2 = True):
+def get_wasm_target(unknown = False):
     """Get the appropriate WASM target triple"""
-    return WASM_TARGET_TRIPLE if preview2 else WASM_TARGET_TRIPLE_P1
+    return WASM_TARGET_TRIPLE_UNKNOWN if unknown else WASM_TARGET_TRIPLE