ci: evm_tests are tests hence shouldn't be counted by codecov as untested code (#769)

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# Rationale for this change
`evm_tests.rs` contain cross-language tests that for some reason codecov
mistakes as untested code leading to unwarranted red status on CI.
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 Add `NestedLoopJoinExec`.
 Closes #345.

Since we added `HashJoinExec` in #323 it has been possible to do
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# What changes are included in this PR?
Ignore `evm_tests.rs` in codecov
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# Are these changes tested?
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Yes.

Author: iajoiner

.github/workflows/lint-and-test.yml

@@ -177,7 +177,7 @@ jobs:
       - name: Clean Previous Coverage Artifacts
         run: cargo llvm-cov clean --workspace
       - name: Run Tests to Generate Coverage Data (All Features)
-        run: cargo llvm-cov --no-report --all-features --workspace --exclude proof-of-sql-benches
+        run: cargo llvm-cov --no-report --all-features --workspace --exclude proof-of-sql-benches --ignore-filename-regex evm_tests
       #- name: Run Tests to Generate Coverage Data (Rayon Only)
       #  run: cargo llvm-cov --no-report --no-default-features --features="rayon"
       #- name: Run Tests to Generate Coverage Data (Blitzar Only)