Do not fail for codecov error (radius-project#7429)

# Description

Tokenless upload (forked repo pr) can be throttled like below. This is
to unblock the build even if codecov is failed.

```
==> Uploader SHASUM verified (e3ea28a069fe174eb99ac2ffb523bfb55d5d29a7cfd93ef48cde12e9b552b492  codecov)
info - 2024-04-02 16:12:29,890 -- ci service found: github-actions
debug - 2024-04-02 16:12:29,893 -- versioning system found: <class 'codecov_cli.helpers.versioning_systems.GitVersioningSystem'>
debug - 2024-04-02 16:12:29,893 -- Loading config from .codecov.yml
debug - 2024-04-02 16:12:29,895 -- Starting create commit process --- {"commit_sha": "babae5be5a94d[64](https://github.com/radius-project/radius/actions/runs/8525878516/job/23353867349?pr=7390#step:7:65)fd7976b80e94905255116e920", "parent_sha": null, "pr": "7390", "branch": "vishwahiremat/recipe_show_cmd", "slug": "radius-project/radius", "token": null, "service": "github", "enterprise_url": null}
info - 2024-04-02 16:12:30,144 -- The PR is happening in a forked repo. Using tokenless upload.
info - 2024-04-02 16:12:30,334 -- Process Commit creating complete
debug - 2024-04-02 16:12:30,334 -- Commit creating result --- {"result": "RequestResult(error=RequestError(code='HTTP Error 429', params={}, description='{\"detail\":\"Tokenless has reached GitHub rate limit. Please upload using a token: https://docs.codecov.com/docs/adding-the-codecov-token. Expected available in 1188 seconds.\"}'), warnings=[], status_code=429, text='{\"detail\":\"Tokenless has reached GitHub rate limit. Please upload using a token: https://docs.codecov.com/docs/adding-the-codecov-token. Expected available in 1188 seconds.\"}')"}
error - 2024-04-02 16:12:30,334 -- Commit creating failed: {"detail":"Tokenless has reached GitHub rate limit. Please upload using a token: https://docs.codecov.com/docs/adding-the-codecov-token. Expected available in 1188 seconds."}
Error: Codecov: Failed to properly create commit: The process '/home/runner/work/_actions/codecov/codecov-action/v4/dist/codecov' failed with exit code 1
```

## Type of change

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Fixes: #issue_number

Signed-off-by: Young Bu Park <[email protected]>

.github/workflows/build.yaml

@@ -108,7 +108,7 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
           codecov_yml_path: ./.codecov.yml
           file: ./dist/unit_test/ut_coverage.out
-          fail_ci_if_error: true
+          fail_ci_if_error: false
           verbose: true
       - name: Process Unit Test Results
         uses: ./.github/actions/process-test-results