[RUM-4986] Decrease Batch Metrics sample rate to 10% of its original value

[plousada]

What does this PR do?

Reduce the amount we send batch telemetry rate to 10% of its original value.

Motivation

What inspired you to submit this pull request?

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

All modified and coverable lines are covered by tests ✅

Project coverage is 69.98%. Comparing base (4a3bc9f) to head (93bf5c7).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2146      +/-   ##
===========================================
- Coverage    70.05%   69.98%   -0.06%     
===========================================
  Files          726      726              
  Lines        26995    26975      -20     
  Branches      4524     4520       -4     
===========================================
- Hits         18909    18878      -31     
- Misses        6818     6828      +10     
- Partials      1268     1269       +1     

Files	Coverage Δ
...id/core/internal/metrics/BatchMetricsDispatcher.kt	98.65% <ø> (ø)

... and 34 files with indirect coverage changes