ci: reintroduce code coverage reporting with cargo-llvm-cov

[buraksenn]

Which issue does this PR close?

• Closes Coverage jobs are failing on master: Failed to compile tests! Error: sql_integration: linking with cc failed: exit status: 1" #3678.

Rationale for this change

Code coverage has been disabled since #3678. The reason was it failed because of sql_integration test binary. This PR reintroduces it

What changes are included in this PR?

Reintroduce code coverage

Are these changes tested?

Not yet I need to test if tokenless coverage upload works described in https://about.codecov.io/blog/tokenless-uploads-for-github-actions/. If not I'll create a PR in my fork https://github.com/buraksenn/datafusion

Are there any user-facing changes?

no

[github-actions]

Thank you for opening this pull request!

Reviewer note: cargo-semver-checks reported the current version number is not SemVer-compatible with the changes in this pull request (compared against the base branch).

Details

     Cloning apache/main
    Building datafusion v54.0.0 (current)
       Built [ 103.067s] (current)
     Parsing datafusion v54.0.0 (current)
      Parsed [   0.035s] (current)
    Building datafusion v54.0.0 (baseline)
       Built [ 104.111s] (baseline)
     Parsing datafusion v54.0.0 (baseline)
      Parsed [   0.036s] (baseline)
    Checking datafusion v54.0.0 -> v54.0.0 (no change; assume patch)
     Checked [   0.597s] 223 checks: 223 pass, 30 skip
     Summary no semver update required
    Finished [ 209.243s] datafusion
    Building datafusion-ffi v54.0.0 (current)
       Built [  59.405s] (current)
     Parsing datafusion-ffi v54.0.0 (current)
      Parsed [   0.061s] (current)
    Building datafusion-ffi v54.0.0 (baseline)
       Built [  61.559s] (baseline)
     Parsing datafusion-ffi v54.0.0 (baseline)
      Parsed [   0.062s] (baseline)
    Checking datafusion-ffi v54.0.0 -> v54.0.0 (no change; assume patch)
     Checked [   0.226s] 223 checks: 222 pass, 1 fail, 0 warn, 30 skip

--- failure feature_missing: package feature removed or renamed ---

Description:
A feature has been removed from this package's Cargo.toml. This will break downstream crates which enable that feature.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#cargo-feature-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.48.0/src/lints/feature_missing.ron

Failed in:
  feature tarpaulin_include in the package's Cargo.toml

     Summary semver requires new major version: 1 major and 0 minor checks failed
    Finished [ 122.513s] datafusion-ffi