RUM-2271: Add files under kotlin source set to the repository information

[0xnm]

What does this PR do?

AGP 7.0.0 introduced the additional kotlinDirectories to explicitly separate kotlin and java source sets, so if all the files are under kotlin, we were missing it. This PR fixes that.

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• [ ] Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

Merging #212 (1537f56) into develop (0fd0071) will decrease coverage by 0.97%. The diff coverage is 28.57%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #212 +/- ## ============================================= - Coverage 79.05% 78.08% -0.97% - Complexity 186 187 +1 ============================================= Files 22 22 Lines 654 666 +12 Branches 81 85 +4 ============================================= + Hits 517 520 +3 - Misses 107 117 +10 + Partials 30 29 -1 ``` | [Files](https://app.codecov.io/gh/DataDog/dd-sdk-android-gradle-plugin/pull/212?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | Coverage Δ | | |---|---|---| | [...og/gradle/plugin/internal/GitRepositoryDetector.kt](https://app.codecov.io/gh/DataDog/dd-sdk-android-gradle-plugin/pull/212?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-ZGQtc2RrLWFuZHJvaWQtZ3JhZGxlLXBsdWdpbi9zcmMvbWFpbi9rb3RsaW4vY29tL2RhdGFkb2cvZ3JhZGxlL3BsdWdpbi9pbnRlcm5hbC9HaXRSZXBvc2l0b3J5RGV0ZWN0b3Iua3Q=) | `97.06% <100.00%> (ø)` | | | [...n/com/datadog/gradle/plugin/internal/ProjectExt.kt](https://app.codecov.io/gh/DataDog/dd-sdk-android-gradle-plugin/pull/212?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-ZGQtc2RrLWFuZHJvaWQtZ3JhZGxlLXBsdWdpbi9zcmMvbWFpbi9rb3RsaW4vY29tL2RhdGFkb2cvZ3JhZGxlL3BsdWdpbi9pbnRlcm5hbC9Qcm9qZWN0RXh0Lmt0) | `100.00% <ø> (ø)` | | | [...com/datadog/gradle/plugin/DdAndroidGradlePlugin.kt](https://app.codecov.io/gh/DataDog/dd-sdk-android-gradle-plugin/pull/212?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-ZGQtc2RrLWFuZHJvaWQtZ3JhZGxlLXBsdWdpbi9zcmMvbWFpbi9rb3RsaW4vY29tL2RhdGFkb2cvZ3JhZGxlL3BsdWdpbi9EZEFuZHJvaWRHcmFkbGVQbHVnaW4ua3Q=) | `54.65% <23.08%> (-2.22%)` | :arrow_down: |