Stabilize ABI errors (#7241)

## Description

Stabilize the `error_type` feature.
Fixes #6765

## Checklist

- [ ] I have linked to any relevant issues.
- [ ] I have commented my code, particularly in hard-to-understand
areas.
- [ ] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [ ] If my change requires substantial documentation changes, I have
[requested support from the DevRel
team](https://github.com/FuelLabs/devrel-requests/issues/new/choose)
- [ ] I have added tests that prove my fix is effective or that my
feature works.
- [ ] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [ ] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [ ] I have requested a review from the relevant team or maintainers.

---------

Co-authored-by: Igor Rončević <ironcev@hotmail.com>

Author: IGI-111

.github/workflows/ci.yml

@@ -478,10 +478,6 @@ jobs:
         run: cargo run --locked --release -p forc -- test --release --locked --path ./test/src/sdk-harness
       - name: Cargo Test sway-lib-std
         run: cargo test --locked --release --manifest-path ./test/src/sdk-harness/Cargo.toml -- --nocapture
-      - name: Build All Tests - Experimental Feature 'error_type'
-        run: cargo run --locked --release -p forc -- build --experimental error_type --release --locked --path ./test/src/sdk-harness
-      - name: Cargo Test sway-lib-std - Experimental Feature 'error_type'
-        run: cargo test --locked --release --manifest-path ./test/src/sdk-harness/Cargo.toml -- --nocapture
 
   forc-run-benchmarks:
     runs-on: buildjet-4vcpu-ubuntu-2204
@@ -548,18 +544,10 @@ jobs:
         run: forc test --path sway-lib-std
       - name: Run Std Unit Tests (Release)
         run: forc test --release --path sway-lib-std
-      - name: Run Std Unit Tests - Experimental feature 'error_type' (Debug)
-        run: forc test --experimental error_type --path sway-lib-std
-      - name: Run Std Unit Tests - Experimental feature 'error_type' (Release)
-        run: forc test --release --experimental error_type --path sway-lib-std
       - name: Run In Language Unit Tests (Debug)
         run: forc test --path test/src/in_language_tests
       - name: Run In Language Unit Tests (Release)
         run: forc test --release --path test/src/in_language_tests
-      - name: Run In Language Unit Tests - Experimental feature 'error_type' (Debug)
-        run: forc test --experimental error_type --path test/src/in_language_tests
-      - name: Run In Language Unit Tests - Experimental feature 'error_type' (Release)
-        run: forc test --release --experimental error_type --path test/src/in_language_tests
 
   forc-pkg-fuels-deps-check:
     runs-on: buildjet-4vcpu-ubuntu-2204

forc-pkg/src/pkg.rs

@@ -1775,8 +1775,7 @@ pub fn compile(
 
     const ENCODING_V0: &str = "0";
     const ENCODING_V1: &str = "1";
-    const SPEC_VERSION: &str = "1";
-    const SPEC_VERSION_ERROR_TYPE: &str = "1.1";
+    const SPEC_VERSION: &str = "1.1";
 
     let mut program_abi = match pkg.target {
         BuildTarget::Fuel => {
@@ -1798,11 +1797,7 @@ pub fn compile(
                     } else {
                         ENCODING_V0.into()
                     },
-                    if experimental.error_type {
-                        SPEC_VERSION_ERROR_TYPE.into()
-                    } else {
-                        SPEC_VERSION.into()
-                    }
+                    SPEC_VERSION.into()
                 ),
                 Some(sway_build_config.clone()),
                 metrics

forc-plugins/forc-client/proxy_abi/proxy_contract-abi.json

@@ -1,6 +1,6 @@
 {
   "programType": "contract",
-  "specVersion": "1",
+  "specVersion": "1.1",
   "encodingVersion": "1",
   "concreteTypes": [
     {

forc-plugins/forc-client/src/op/deploy.rs

@@ -62,7 +62,7 @@ impl ScriptCallHandler {
 mod tests {
     use super::{ScriptCallHandler, Type};
 
-    const TEST_JSON_ABI: &str = r#"{"programType": "contract","specVersion": "1","encodingVersion": "1","metadataTypes":[],
+    const TEST_JSON_ABI: &str = r#"{"programType": "contract","specVersion": "1.1","encodingVersion": "1","metadataTypes":[],
     "concreteTypes":[{"concreteTypeId":"2e38e77b22c314a449e91fafed92a43826ac6aa403ae6a8acb6cf58239fbaf5d",
     "type":"()"},{"concreteTypeId":"b760f44fa5965c2474a3b471467a22c43185152129295af588b022ae50b50903","type":"bool"},
     {"concreteTypeId":"c89951a24c6ca28c13fd1cfdc646b2b656d69e61a92b91023be7eb58eb914b6b","type":"u8"}],

forc-plugins/forc-client/src/op/run/encode.rs

@@ -1,6 +1,6 @@
 {
   "programType": "contract",
-  "specVersion": "1",
+  "specVersion": "1.1",
   "encodingVersion": "1",
   "concreteTypes": [
     {

forc-plugins/forc-client/src/util/tx.rs

@@ -1,6 +1,6 @@
 {
   "programType": "contract",
-  "specVersion": "1",
+  "specVersion": "1.1",
   "encodingVersion": "1",
   "concreteTypes": [
     {

forc-plugins/forc-client/test/data/big_contract/big_contract-abi.json

@@ -1,6 +1,6 @@
 {
   "programType": "predicate",
-  "specVersion": "1",
+  "specVersion": "1.1",
   "encodingVersion": "1",
   "concreteTypes": [
     {

forc-plugins/forc-client/test/data/contract_with_types/contract_with_types-abi.json

@@ -1,6 +1,6 @@
 {
   "programType": "script",
-  "specVersion": "1",
+  "specVersion": "1.1",
   "encodingVersion": "1",
   "concreteTypes": [
     {