Add version to top level project for nexusPublishing extension

[fuzzybinary]

What does this PR do?

It appears the nexusPublishing extension only evaluates whether a deployment goes to staging or not at the Project level, so we need to add the version at that level in order for snapshot builds to go through

Additional Notes

Anything else we should know when reviewing?

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 #1096 (21cf147) into develop (3f38162) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1096      +/-   ##
===========================================
- Coverage    83.27%   83.23%   -0.04%     
===========================================
  Files          273      273              
  Lines         9348     9348              
  Branches      1503     1503              
===========================================
- Hits          7784     7780       -4     
- Misses        1146     1151       +5     
+ Partials       418      417       -1     

Impacted Files	Coverage Δ
...ain/java/com/datadog/opentracing/PendingTrace.java	56.03% <0.00%> (-4.31%)	⬇️
...droid/rum/tracking/ActivityViewTrackingStrategy.kt	86.54% <0.00%> (-1.92%)	⬇️
...rc/main/java/com/datadog/opentracing/DDTracer.java	54.81% <0.00%> (-1.67%)	⬇️
.../android/rum/internal/monitor/DatadogRumMonitor.kt	92.61% <0.00%> (+0.57%)	⬆️
...android/rum/internal/ndk/DatadogNdkCrashHandler.kt	88.65% <0.00%> (+1.08%)	⬆️
...ndroid/core/internal/persistence/file/EventMeta.kt	90.00% <0.00%> (+10.00%)	⬆️
...android/log/internal/logger/TelemetryLogHandler.kt	100.00% <0.00%> (+25.00%)	⬆️