Improve InsightsCollector.kt methods signatures

[kikoveiga]

What does this PR do?

Removes unused startedTimestamp parameters from InsightsCollector interface's methods.

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 71.43%. Comparing base (8a78565) to head (6f6faa3).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3207   +/-   ##
========================================
  Coverage    71.42%   71.43%           
========================================
  Files          933      933           
  Lines        34580    34580           
  Branches      5847     5847           
========================================
+ Hits         24698    24699    +1     
+ Misses        8249     8240    -9     
- Partials      1633     1641    +8     

Files with missing lines	Coverage Δ
...roid/insights/internal/DefaultInsightsCollector.kt	76.71% <100.00%> (ø)
...roid/rum/internal/domain/scope/RumResourceScope.kt	90.93% <100.00%> (-0.57%)	⬇️
.../android/rum/internal/domain/scope/RumViewScope.kt	93.89% <100.00%> (-0.52%)	⬇️
...m/internal/metric/slowframes/SlowFramesListener.kt	94.64% <100.00%> (ø)

... and 33 files with indirect coverage changes

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