ci: never fail test-with-coverage on a Codecov upload error

[AdaWorldAPI]

test-with-coverage went red on #1327 (twice) and #1328 (twice) after every test had passed. Each time the cause was the Upload coverage to Codecov step:

Error: write EPROTO … ssl3_read_bytes:ssl/tls alert handshake failure … SSL alert number 40
    at WriteWrap.onWriteComplete (node:internal/stream_base_commons:87:19)

The step already sets fail_ci_if_error: false, but that flag only covers errors the Codecov uploader reports. Here the action itself throws on its first TLS connection, before the uploader runs, so the step fails anyway.

Change

.github/workflows/rust-test.yml: add continue-on-error: true to the upload step, with a comment explaining why. This is one line plus the comment.

What it does not hide

Test failures still fail the job. They surface in the preceding cargo llvm-cov step, which is unchanged. Only a failed upload is made non-blocking, which is what fail_ci_if_error: false already declared as the intent.

The YAML parses (yaml.safe_load).

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https://claude.ai/code/session_01G22yT6htkcdyXsihxxXdrg

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