RUMM-1680: Fix missing datadog-native-lib in the NDK artifact by downgrading CMake version

[0xnm]

What does this PR do?

CMake has a bug in the File API, which is fixed in the version 3.20.4. But, unfortunately, we cannot use this version, because latest version available in the Android SDK Manager is 3.18.1 currently.

Bug leads to the wrong path of the datadog-native-lib target, so it is not packed in the final AAR (this happens only for debug builds, release builds are fine, because there is is direct dependency and not transitive through datadog-native-lib-test as in debug).

This change downgrades CMake to version 3.10.2, which has no File API, so AGP is using another way to figure out the target path. AGP is using CMake File API starting from the version 4.2 (and this API is available in the CMake newer than 3.14.0, see here).

Another solution is to use custom CMake distribution, not via Android SDK Manager, but then we would need to install CMake + Ninja manually in the build environment.

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 #716 (2663242) into master (330a8b9) will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #716      +/-   ##
============================================
+ Coverage     88.68%   88.72%   +0.04%     
- Complexity     1717     1720       +3     
============================================
  Files           188      188              
  Lines          5655     5655              
  Branches        700      700              
============================================
+ Hits           5015     5017       +2     
  Misses          395      395              
+ Partials        245      243       -2     

Impacted Files	Coverage Δ
...droid/rum/tracking/ActivityViewTrackingStrategy.kt	86.54% <0.00%> (-1.92%)	⬇️
...droid/rum/internal/domain/scope/RumSessionScope.kt	97.78% <0.00%> (-1.11%)	⬇️
...g/android/rum/internal/domain/scope/RumEventExt.kt	81.98% <0.00%> (-0.90%)	⬇️
...m/internal/domain/scope/ExternalResourceTimings.kt	67.65% <0.00%> (ø)
...g/internal/domain/event/DdSpanToSpanEventMapper.kt	91.84% <0.00%> (ø)
...l/net/info/BroadcastReceiverNetworkInfoProvider.kt	79.17% <0.00%> (ø)
...atadog/android/core/configuration/Configuration.kt	96.27% <0.00%> (+0.37%)	⬆️
...roid/rum/internal/domain/scope/RumResourceScope.kt	94.00% <0.00%> (+0.67%)	⬆️
...id/rum/internal/domain/event/RumEventSerializer.kt	92.22% <0.00%> (+1.11%)	⬆️
...oid/src/main/kotlin/com/datadog/android/Datadog.kt	78.41% <0.00%> (+1.14%)	⬆️
... and 1 more