ci: remove concurrency from individual jobs, remove if always (#2763)

Author: DaniPopes

.github/workflows/ci.yml

@@ -71,10 +71,6 @@ jobs:
         name: etherscan tests
         runs-on: ubuntu-latest
         timeout-minutes: 30
-        concurrency: etherscan-tests-${{ github.head_ref || github.run_id }}
-        # Run after main tests are done to avoid rate limiting,
-        # regardless of whether they were successful
-        if: ${{ always() }}
         needs: test
         steps:
             - uses: actions/checkout@v3
@@ -89,7 +85,6 @@ jobs:
     #     name: live tests
     #     runs-on: ubuntu-latest
     #     timeout-minutes: 30
-    #     concurrency: live-tests-${{ github.head_ref || github.run_id }}
     #     steps:
     #         - uses: actions/checkout@v3
     #         - uses: dtolnay/rust-toolchain@stable
@@ -184,7 +179,6 @@ jobs:
         name: Examples
         runs-on: ubuntu-latest
         timeout-minutes: 30
-        concurrency: examples-${{ github.head_ref || github.run_id }}
         steps:
             - uses: actions/checkout@v3
             - uses: dtolnay/rust-toolchain@stable