[Infra] Codecov upload step fails CI when CODECOV_TOKEN is missing (fail_ci_if_error: true)

[ogazboiz]

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Why this matters

Both the Backend CI and Soroban Contracts CI jobs run a final codecov/codecov-action@v5 step with fail_ci_if_error: true. When CODECOV_TOKEN is missing/invalid (as it currently is), that step fails and turns the whole job red even when build, tests, and coverage all passed. Right now the contracts job gets all the way through build + 95 tests + tarpaulin coverage and only dies on this upload.

Acceptance criteria

• CI no longer fails solely because of Codecov upload. Either:
  • set CODECOV_TOKEN as a repo secret and confirm upload succeeds, OR
  • set fail_ci_if_error: false on both Codecov steps so coverage upload is best-effort
• Contracts job is green when build + tests + coverage pass
• Backend job's pass/fail reflects tests, not the upload

Files to touch

• .github/workflows/ci.yml (the two Upload * coverage to Codecov steps)

Out of scope

• Fixing the backend test failures themselves (separate issue)

[Mosas2000]

@Mosas2000 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi maintainer, I'd like to take on this issue as i'll fully implement what is requested as i'm a full-stack developer with experiences.

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This issue has been completed by @Mosas2000 as part of the Stellar Wave Program's 5th Wave 🥳

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